Complete Controllability Conditions for Linear Singularly Perturbed Time-Invariant Systems with Multiple Delays via Chang-Type Transformation. - Olga Tsekhan (Axioms, 2019)

Stability of Singularly Perturbed Systems with Delay on Homogeneous Time Scales. - Ewa Pawluszewicz; Olga Tsekhan (KKA, 2020)

Controllability of Singularly Perturbed Linear Time-Invariant Systems on Time Scales. - Olga Tsekhan; Ewa Pawluszewicz (MMAR, 2021)

Observability of Singularly Perturbed Linear Time-Varying Systems on Time Scales. - Olga Tsekhan; Ewa Pawluszewicz (MMAR, 2022)

Stability and stabilisability of the singularly perturbed system with delay on time scales: a decomposition approach. - Ewa Pawluszewicz; Olga Tsekhan (Int. J. Control, 2022)