Towards a solution of the state-space realization problem of a set of multi-input multi-output nonlinear difference equations. - Ülle Kotta (ECC, 1999)

Transfer Equivalence and Realization of Nonlinear Higher Order Input/Output Difference Equations Using Mathematica. - Ülle Kotta; Maris Tõnso (J. Circuits Syst. Comput., 1999)

Irreducibility conditions for nonlinear input-output difference equations. - Ülle Kotta (CDC, 2000)

Input-output decoupling of nonlinear recursive systems. - Ülle Kotta (Kybernetika, 2000)

Comments on "On the discrete-time normal form". - Ülle Kotta (IEEE Trans. Autom. Control., 2000)

Transfer equivalence and realization of nonlinear higher order input-output difference equations. - Ülle Kotta; Alan Solon Ivor Zinober; P. Liu (Autom., 2001)

Generalized controlled invariance for discrete-time nonlinear systems with an application to the dynamic disturbance decoupling problem. - Eduardo Aranda-Bricaire; Ülle Kotta (IEEE Trans. Autom. Control., 2001)

Systems with associative dynamics. - Ronald K. Pearson; Ülle Kotta; Sven Nomm (Kybernetika, 2002)

On state space realizability of bilinear systems described by higher order difference equations. - Ülle Kotta; Sven Nomm; Alan Solon Ivor Zinober (CDC, 2003)

Realization of nonlinear systems described by input/output differential equations: Equivalence of different methods. - Ülle Kotta; Tanel Mullari (ECC, 2003)

A geometric solution to the dynamic disturbance decoupling for discrete-time nonlinear systems. - Eduardo Aranda-Bricaire; Ülle Kotta (Kybernetika, 2004)

Equivalence to a (Strict) Feedforward Form of Nonlinear Discrete-Time Single-Input Control Systems. - Claude H. Moog; Ülle Kotta (CDC/ECC, 2005)

Equivalence of Different Realization Methods for Higher Order Nonlinear Input Output Differential Equations. - Ülle Kotta; Tanel Mullari (Eur. J. Control, 2005)

Irreducibility Conditions for Continuous-time Multi-input Multi-output Nonlinear Systems. - Ülle Kotta; Palle Kotta; Sven Nomm; Maris Tõnso (ICARCV, 2006)

Neural Networks Based ANARX Structure for Identification and Model Based Control. - Eduard Petlenkov; Sven Nomm; Ülle Kotta (ICARCV, 2006)

On realizability of neural networks-based input-output models in the classical state-space form. - Ülle Kotta; Fahmida N. Chowdhury; Sven Nõmm (Autom., 2006)

Simplification of the generalized state equations. - Tanel Mullari; Ülle Kotta (Kybernetika, 2006)

Webmathematica based tools for nonlinear control systems. - Heli Rennik; Maris Tõnso; Ülle Kotta (ICINCO-SPSMC, 2007)

State space realization of bilinear continuous-time input-output equations. - Ülle Kotta; Tanel Mullari; Alan Solon Ivor Zinober; Palle Kotta (Int. J. Control, 2007)

Transfer equivalence and reduction of nonlinear delta differential equations on homogeneous time scale. - Daniele Casagrande; Ülle Kotta; Malgorzata Wyrwas; Maris Tonso (ACC, 2008)

A polynomial approach to the synthesis of observers for nonlinear systems. - Miroslav Halás; Ülle Kotta (CDC, 2008)

Irreducibility and reduction of nonlinear control systems: Unification and extension via pseudo-linear algebra. - Ülle Kotta; Palle Kotta; Miroslav Halás (ICARCV, 2008)

Non-commutative determinants in nonlinear control theory: Preliminary ideas. - Ülle Kotta; Alar Leibak; Miroslav Halás (ICARCV, 2008)

Differential rings associated with control systems on regular time scales. - Zbigniew Bartosiewicz; Ülle Kotta; Ewa Pawluszewicz; Malgorzata Wyrwas (ECC, 2009)

Realization of Continuous-Time Nonlinear Input-Output Equations: Polynomial Approach. - Maris Tõnso; Ülle Kotta (EUROCAST, 2009)

Submersive rational difference systems and their accessibility. - Miroslav Halás; Ülle Kotta; Ziming Li 002; Huaifu Wang; Chunming Yuan (ISSAC, 2009)

Transformation the Nonlinear System into the Observer Form: Simplification and Extension. - Tanel Mullari; Ülle Kotta (Eur. J. Control, 2009)

On classical state space realisability of quadratic input-output differential equations. - Ülle Kotta; Palle Kotta; Maris Tõnso; Alan Solon Ivor Zinober (Int. J. Control, 2009)

Irreducibility, reduction and transfer equivalence of nonlinear input-output equations on homogeneous time scales. - Ülle Kotta; Zbigniew Bartosiewicz; Ewa Pawluszewicz; Malgorzata Wyrwas (Syst. Control. Lett., 2009)

Discussion on: "Unified Approach to the Problem of Full Decoupling via Output Feedback". - Ülle Kotta; Tanel Mullari (Eur. J. Control, 2010)

Reduction and transfer equivalence of nonlinear control systems: unification and extension via pseudo-linear algebra. - Ülle Kotta; Palle Kotta; Miroslav Halás (Kybernetika, 2010)

Transfer Equivalence and Realization of Nonlinear Input-Output Delta-Differential Equations on Homogeneous Time Scales. - Daniele Casagrande; Ülle Kotta; Maris Tonso; Malgorzata Wyrwas (IEEE Trans. Autom. Control., 2010)

Minimal realization of nonlinear MIMO equations in state-space form: Polynomial approach. - Juri Belikov; Ülle Kotta; Maris Tõnso (CDC/ECC, 2011)

Model matching problem for discrete-time nonlinear systems: Transfer function approach. - Juri Belikov; Miroslav Halás; Ülle Kotta; Claude H. Moog (ICCA, 2011)

On applicability of LPV tools for bilinear systems. - Juri Belikov; Ülle Kotta; Maris Tõnso (ICCA, 2011)

Extended observer form for discrete-time nonlinear control systems. - Vadim Kaparin; Ülle Kotta (ICCA, 2011)

State-space realization of nonlinear input-output equations: Unification and extension via pseudo-linear algebra. - Ülle Kotta; Palle Kotta; Maris Tõnso; Miroslav Halás (ICCA, 2011)

Comparison of neural networks-based ANARX and NARX models by application of correlation tests. - Sven Nõmm; Ülle Kotta (IJCNN, 2011)

Minimal realisation of bilinear and quadratic input-output difference equations in state-space form. - Juri Belikov; Palle Kotta; Ülle Kotta; Alan Solon Ivor Zinober (Int. J. Control, 2011)

Control systems on regular time scales and their differential rings. - Zbigniew Bartosiewicz; Ülle Kotta; Ewa Pawluszewicz; Malgorzata Wyrwas (Math. Control. Signals Syst., 2011)

Some remarks on Kähler differentials and ordinary differentials in nonlinear control theory. - Guofeng Fu; Miroslav Halás; Ülle Kotta; Ziming Li 002 (Syst. Control. Lett., 2011)

Linear Input-Output Equivalence and Row Reducedness of Discrete-Time Nonlinear Systems. - Ülle Kotta; Zbigniew Bartosiewicz; Sven Nomm; Ewa Pawluszewicz (IEEE Trans. Autom. Control., 2011)

Explicit formulas for the state coordinates in nonlinear MIMO realization problem on homogeneous time scales. - Juri Belikov; Ülle Kotta; Maris Tonso (CCA, 2012)

Dynamic measurement feedback in discrete-time nonlinear control systems. - Arvo Kaldmäe; Ülle Kotta (ACC, 2012)

Dual algebraic framework for discrete-time nonlinear control systems. - Zbigniew Bartosiewicz; Ülle Kotta; Claude H. Moog; Tanel Mullari; Ewa Pawluszewicz (CDC, 2012)

Practical polynomial formulas in MIMO nonlinear realization problem. - Juri Belikov; Palle Kotta; Ülle Kotta; Maris Tonso (CDC, 2012)

Realization of discrete-time nonlinear input-output equations: Polynomial approach. - Ülle Kotta; Maris Tonso (Autom., 2012)

A transfer function approach to the realisation problem of nonlinear systems. - Miroslav Halás; Ülle Kotta (Int. J. Control, 2012)

State-space realization of nonlinear control systems: unification and extension via pseudo-linear algebra. - Juri Belikov; Ülle Kotta; Maris Tõnso (Kybernetika, 2012)

Adaptive LQR controller for Networked Control Systems subjected to random communication delays. - Seshadhri Srinivasan; Mishiga Vallabhan; Srini Ramaswamy; Ülle Kotta (ACC, 2013)

NLControl: Symbolic package for study of nonlinear control systems. - Juri Belikov; Ülle Kotta; Maris Tonso (CACSD, 2013)

Input-output linearization by dynamic output feedback. - Arvo Kaldmäe; Ülle Kotta (ECC, 2013)

A layered architecture for control functionality implementation in smart grids. - Seshadhri Srinivasan; Ülle Kotta; Srini Ramaswamy (ICNSC, 2013)

On Flatness of Discrete-Time Nonlinear Systems. - Arvo Kaldmäe; Ülle Kotta (NOLCOS, 2013)

The Minimal Time-Varying Realization of a Nonlinear Time-Invariant System. - Ülle Kotta; Claude H. Moog; Maris Tõnso (NOLCOS, 2013)

Measurement feedback disturbance decoupling in discrete-time nonlinear systems. - Arvo Kaldmäe; Ülle Kotta; Alexey Ye. Shumsky; Alexey N. Zhirabok (Autom., 2013)

Extended observer form: simple existence conditions. - Vadim Kaparin; Ülle Kotta; Tanel Mullari (Int. J. Control, 2013)

Feedback linearization and lattice theory. - Ülle Kotta; Maris Tõnso; Alexey Ye. Shumsky; Alexey N. Zhirabok (Syst. Control. Lett., 2013)

Dynamic feedback linearization of nonlinear control systems on homogenous time scale. - Juri Belikov; Ülle Kotta; Maris Tonso; Zbigniew Bartosiewicz; Malgorzata Wyrwas (CCA, 2014)

Accommodation to defects in the discrete dynamic systems. - Alexey N. Zhirabok; Ülle Kotta; Alexey E. Shumsky (Autom. Remote. Control., 2014)

Input-output linearization of discrete-time systems by dynamic output feedback. - Arvo Kaldmäe; Ülle Kotta (Eur. J. Control, 2014)

Comparison of LPV and nonlinear system theory: A realization problem. - Juri Belikov; Ülle Kotta; Maris Tõnso (Syst. Control. Lett., 2014)

Adjoint Polynomial Formulas for Nonlinear State-Space Realization. - Juri Belikov; Ülle Kotta; Maris Tonso (IEEE Trans. Autom. Control., 2014)

Transforming a set of nonlinear input-ouput equations into Popov form. - Zbigniew Bartosiewicz; Ülle Kotta; Ewa Pawluszewicz; Maris Tonso; Malgorzata Wyrwas (CDC, 2015)

On integrability of observable space for discrete-time analytic systems. - Yu Kawano; Ülle Kotta (CDC, 2015)

Input-output linearization by dynamic output feedback on homogeneous time scales. - Monika Ciulkin; Ewa Pawluszewicz; Vadim Kaparin; Ülle Kotta (MMAR, 2015)

Relaxing realizability conditions for discrete-time nonlinear systems. - Ülle Kotta; Kurt Schlacher; Maris Tõnso (Autom., 2015)

Realization of nonlinear MIMO system on homogeneous time scales. - Juri Belikov; Ülle Kotta; Maris Tõnso (Eur. J. Control, 2015)

Transformation of nonlinear state equations into the observer form: Necessary and sufficient conditions in terms of one-forms. - Vadim Kaparin; Ülle Kotta (Kybernetika, 2015)

Static state feedback linearization of nonlinear control systems on homogeneous time scales. - Zbigniew Bartosiewicz; Ülle Kotta; Maris Tõnso; Malgorzata Wyrwas (Math. Control. Signals Syst., 2015)

On Integrability of Observable Space for Discrete-Time Polynomial Control Systems. - Yu Kawano; Ülle Kotta (IEEE Trans. Autom. Control., 2015)

Disturbance decoupling problem in finite automata: Sensor location problem. - Arvo Kaldmäe; Ülle Kotta; Alexey Ye. Shumsky; Alexey N. Zhirabok (CCA, 2016)

Disturbance decoupling in nonlinear hybrid systems. - Arvo Kaldmäe; Ülle Kotta; Alexey Ye. Shumsky; Alexey N. Zhirabok (ICCA, 2016)

Linearization by generalized input-output injections on homogeneous time scales. - Monika Ciulkin; Ewa Pawluszewicz; Vadim Kaparin; Ülle Kotta (MMAR, 2016)

Adaptive Controller for Networked Control Systems Subjected to Random Communication Delays. - Seshadhri Srinivasan; Saravanakumar Gurusamy; B. Subathra; N. Sundarajan; Ülle Kotta; Srini Ramaswamy; Valentina Emilia Balas (SOFA (1), 2016)

Algebraic Approach for Analysis and Control of a Water Tank System. - Juri Belikov; Ülle Kotta; Aleksei Tepljakov (Inf. Technol. Control., 2016)

On accessibility conditions for state space nonlinear control systems on homogeneous time scales. - Zbigniew Bartosiewicz; Ülle Kotta; Tanel Mullari; Maris Tõnso; Malgorzata Wyrwas (Syst. Control. Lett., 2016)

Single-experiment observability decomposition of discrete-time analytic systems. - Yu Kawano; Ülle Kotta (Syst. Control. Lett., 2016)

Feedback linearization of an active magnetic bearing system operated with a zero-bias flux. - Arkadiusz Mystkowski; Vadim Kaparin; Ülle Kotta; Ewa Pawluszewicz; Maris Tõnso (Int. J. Appl. Math. Comput. Sci., 2017)

Input-output decoupling of discrete-time nonlinear systems by dynamic measurement feedback. - Arvo Kaldmäe; Ülle Kotta (Eur. J. Control, 2017)

Realisation of linear time-varying systems. - Ülle Kotta; Maris Tõnso (Int. J. Control, 2017)

Flatness Based Control of a HVAC System. - Arvo Kaldmäe; Ülle Kotta (Inf. Technol. Control., 2017)

Forward and Backward Shifts of Vector Fields: Towards the Dual Algebraic Framework. - Tanel Mullari; Ülle Kotta; Zbigniew Bartosiewicz; Ewa Pawluszewicz; Claude H. Moog (IEEE Trans. Autom. Control., 2017)

Intrinsic Conditions for Extended Observer Forms for Nonlinear Systems. - Ashutosh Simha; Witold Respondek; Arvo Kaldmäe; Vadim Kaparin; Ülle Kotta (CDC, 2018)

Realization of time-delay systems. - Arvo Kaldmäe; Ülle Kotta (Autom., 2018)

Minimal realizations of nonlinear systems. - Ülle Kotta; Claude H. Moog; Maris Tõnso (Autom., 2018)

Realization of Nonlinear Time-Delay Input-Output Equations. - Arvo Kaldmäe; Ülle Kotta; Maris Tonso (IEEE Control. Syst. Lett., 2018)

Transformation of nonlinear discrete-time system into the extended observer form. - Vadim Kaparin; Ülle Kotta (Int. J. Control, 2018)

Realization of nonlinear input-output equations in controller canonical form. - Arvo Kaldmäe; Ülle Kotta (Kybernetika, 2018)

Nonlinear Orientation Controller for a Compliant Robotic Fish Based on Asymmetric Actuation. - Christian Meurer; Ashutosh Simha; Ülle Kotta; Maarja Kruusmaa (ICRA, 2019)

Motor Failure Tolerant Control System With Self Diagnostics for Unmanned Multirotors. - Leszek Ambroziak; Ashutosh Simha; Ewa Pawluszewicz; Ülle Kotta; Arkadiusz Bozko; Miroslaw Kondratiuk (MMAR, 2019)

Finite determination of accessibility and geometric structure of singular points for nonlinear systems. - Mohammad Amin Sarafrazi; Ülle Kotta; Zbigniew Bartosiewicz (CoRR, 2019)

Degree of Dieudonné determinant defines the order of nonlinear system. - Ülle Kotta; Juri Belikov; Miroslav Halás; Alar Leibak (Int. J. Control, 2019)

Challenges and Perspectives in Control of Ionic Polymer-Metal Composite (IPMC) Actuators: A Survey. - Alvo Aabloo; Juri Belikov; Vadim Kaparin; Ülle Kotta (IEEE Access, 2020)

Comments on "PBH tests for nonlinear systems". - Mohammad Amin Sarafrazi; Zbigniew Bartosiewicz; Ülle Kotta (Autom., 2020)

Comments on 'A new kind of nonlinear disturbance observer for nonlinear systems with applications to cruise control of air-breathing hypersonic vehicles'. - Arvo Kaldmäe; Ülle Kotta (Int. J. Control, 2020)

Weak reachability and controllability of discrete-time nonlinear systems: generic approach and singular points. - Tanel Mullari; Ülle Kotta; Zbigniew Bartosiewicz; Mohammad Amin Sarafrazi; Claude H. Moog; Ewa Pawluszewicz (Int. J. Control, 2020)

Experimental validation of the Newton observer for a nonlinear flux-controlled AMB system operated with zero-bias flux. - Arkadiusz Mystkowski; A. Kierdelewicz; Ülle Kotta; Vadim Kaparin (Int. J. Control, 2020)

A Flapped Paddle-Fin for Improving Underwater Propulsive Efficiency of Oscillatory Actuation. - Ashutosh Simha; Roza Gkliva; Ülle Kotta; Maarja Kruusmaa (IEEE Robotics Autom. Lett., 2020)

Finite determination of accessibility and singular points of nonlinear systems: An algebraic approach. - Mohammad Amin Sarafrazi; Ülle Kotta; Zbigniew Bartosiewicz (Syst. Control. Lett., 2020)

A Test for the Generic Strong Accessibility of Meromorphic Nonlinear Systems. - Francesco Carravetta; Mohammad Amin Sarafrazi; Zbigniew Bartosiewicz; Ülle Kotta (IEEE Trans. Autom. Control., 2020)

Accessibility and orbits for discrete-time nonlinear control systems. - Zbigniew Bartosiewicz; Ülle Kotta; Malgorzata Wyrwas (CDC, 2021)

On the finiteness of accessibility test for nonlinear discrete-time systems. - Mohammad Amin Sarafrazi; Ewa Pawluszewicz; Zbigniew Bartosiewicz; Ülle Kotta (Int. J. Control, 2021)

Accessibility and System Reduction of Nonlinear Time-Delay Control Systems. - Zbigniew Bartosiewicz; Arvo Kaldmäe; Yu Kawano; Ülle Kotta; Ewa Pawluszewicz; Ashutosh Simha; Malgorzata Wyrwas (IEEE Trans. Autom. Control., 2021)

Testing Generic Strong Accessibility of Nonlinear Control Systems via Polynomial (Quadratic) Immersion. - Francesco Carravetta; Mohammad Amin Sarafrazi; Zbigniew Bartosiewicz; Ülle Kotta (CDC, 2022)

On the Stopping Criteria in Nonlinear Unknown Input Observability Condition. - Mohammad Amin Sarafrazi; Ülle Kotta; Zbigniew Bartosiewicz (IEEE Trans. Autom. Control., 2022)

Relations Between Modules Associated to Input-Output Nonlinear Equations with Delays and their Realizations. - Zbigniew Bartosiewicz; Arvo Kaldmäe; Ülle Kotta; Malgorzata Wyrwas (CDC, 2023)

A Note on Observability of Nonlinear Discrete-Time Systems. - Arvo Kaldmäe; Ülle Kotta (CDC, 2023)

Minimal Realizations of Nonlinear Time-Delay Systems. - Arvo Kaldmäe; Zbigniew Bartosiewicz; Ülle Kotta; Malgorzata Wyrwas (IEEE Trans. Autom. Control., 2023)

Extended Observer Form for Nonlinear System with Disturbances: Algorithm and Application. - Vadim Kaparin; Ashutosh Simha; Nilanjan Roy Chowdhury; Ülle Kotta; Yoash Levron; Juri Belikov (ICARCV, 2024)

An algorithm to transform discrete-time state equations into the extended observer form. - Arvo Kaldmäe; Ülle Kotta (Autom., 2024)

Extended observer form with vector fields. - Tanel Mullari; Ülle Kotta; Arvo Kaldmäe; Vadim Kaparin; Ashutosh Simha (Int. J. Control, 2024)

Extended Observer Forms for Submersive Discrete-Time Systems. - Ashutosh Simha; Vadim Kaparin; Tanel Mullari; Ülle Kotta (IEEE Trans. Autom. Control., 2024)

Parameterized Feedback Linearization of Nonlinear Discrete-Time Control Systems. - Arvo Kaldmäe; Ülle Kotta (IEEE Control. Syst. Lett., 2025)

Algebraic Conditions for Accessibility of Discrete-Time Nonlinear Control Systems. - Zbigniew Bartosiewicz; Arvo Kaldmäe; Ülle Kotta; Malgorzata Wyrwas (IEEE Trans. Autom. Control., 2025)