Differential Mutation Based on Population Covariance Matrix. - Karol R. Opara; Jaroslaw Arabas (PPSN (1), 2010)

DMEA - An algorithm that combines differential mutation with the fitness proportionate selection. - Jaroslaw Arabas; Lukasz Bartnik; Karol R. Opara (SDE, 2011)

Decomposition and Metaoptimization of Mutation Operator in Differential Evolution. - Karol R. Opara; Jaroslaw Arabas (ICAISC (SIDE-EC), 2012)

Efficient Calculation of Kendall's τ for Interval Data. - Olgierd Hryniewicz; Karol R. Opara (SMPS, 2012)

Censoring mutation in differential evolution. - Karol R. Opara; Jaroslaw Arabas (SDE, 2013)

Grammatical rhymes in Polish poetry: A quantitative analysis. - Karol R. Opara (Digit. Scholarsh. Humanit., 2015)

Computation of general correlation coefficients for interval data. - Karol R. Opara; Olgierd Hryniewicz (Int. J. Approx. Reason., 2016)

Using a Reverse Engineering Type Paradigm in Clustering. An Evolutionary Programming Based Approach. - Jan W. Owsinski; Janusz Kacprzyk; Karol R. Opara; Jaroslaw Tomasz Stanczak; Slawomir Zadrozny (Fuzzy Sets, Rough Sets, Multisets and Clustering, 2017)

Control Charts Designed Using Model Averaging Approach for Phase Change Detection in Bipolar Disorder. - Katarzyna Kaczmarek-Majer; Olgierd Hryniewicz; Karol R. Opara; Weronika Radziszewska; Anna Olwert; Jan W. Owsinski; Slawomir Zadrozny (SMPS, 2018)

Comparison of mutation strategies in Differential Evolution - A probabilistic perspective. - Karol R. Opara; Jaroslaw Arabas (Swarm Evol. Comput., 2018)

Self-organizing Maps Using Acoustic Features for Prediction of State Change in Bipolar Disorder. - Olga Kaminska; Katarzyna Kaczmarek-Majer; Karol R. Opara; Wit Jakuczun; Monika Dominiak; Anna Antosik-Wójcinska; Lukasz Swiecicki; Olgierd Hryniewicz (KR4HC/ProHealth/TEAAM@AIME, 2019)

Control charts based on fuzzy costs for monitoring short autocorrelated time series. - Olgierd Hryniewicz; Katarzyna Kaczmarek-Majer; Karol R. Opara (Int. J. Approx. Reason., 2019)

Differential Evolution: A survey of theoretical analyses. - Karol R. Opara; Jaroslaw Arabas (Swarm Evol. Comput., 2019)

The contour fitting property of differential mutation. - Karol R. Opara; Jaroslaw Arabas (Swarm Evol. Comput., 2019)

Radial model of differential evolution dynamics. - Karol R. Opara (GECCO Companion, 2020)

Parametrized Benchmarking: an outline of the idea and a feasibility study. - Karol R. Opara; Anas A. Hadi; Ali Wagdy Mohamed (GECCO Companion, 2020)

Smartphone as a monitoring tool for bipolar disorder: a systematic review including data analysis, machine learning algorithms and predictive modelling. - Anna Antosik-Wójcinska; Monika Dominiak; Magdalena Chojnacka; Katarzyna Kaczmarek-Majer; Karol R. Opara; Weronika Radziszewska; Anna Olwert; Lukasz Swiecicki (Int. J. Medical Informatics, 2020)

Population Diversity of Nonelitist Evolutionary Algorithms in the Exploration Phase. - Jaroslaw Arabas; Karol R. Opara (IEEE Trans. Evol. Comput., 2020)

Reverse Clustering - Formulation, Interpretation and Case Studies - Jan W. Owsinski; Jaroslaw Tomasz Stanczak; Karol R. Opara; Slawomir Zadrozny; Janusz Kacprzyk (Springer, 2021)

Recent advances in global optimization of time-delayed systems. - Karol R. Opara (IS, 2022)

Regularization and concave loss functions for estimation of chemical kinetic models. - Karol R. Opara; Pin Pin Oh (Appl. Soft Comput., 2022)

Road Roughness Estimation Through Smartphone-Measured Acceleration. - Karol R. Opara; Karol Brzezinski; Marek Bukowicki; Katarzyna Kaczmarek-Majer (IEEE Intell. Transp. Syst. Mag., 2022)

Semi-supervised vs. supervised learning for mental health monitoring: A case study on bipolar disorder. - Gabriella Casalino; Giovanna Castellano; Olgierd Hryniewicz; Daniel Leite 001; Karol R. Opara; Weronika Radziszewska; Katarzyna Kaczmarek-Majer (Int. J. Appl. Math. Comput. Sci., 2023)

Data-driven human and bot recognition from web activity logs based on hybrid learning techniques. - Marek Gajewski; Olgierd Hryniewicz; Agnieszka Jastrzebska; Mariusz Kozakiewicz; Karol R. Opara; Jan W. Owsinski; Slawomir Zadrozny; Tomasz Zwierzchowski (Digit. Commun. Networks, 2024)