Accessibility and orbits for discrete-time nonlinear control systemsBartosiewicz, Zbigniew; Kotta, Ülle; Wyrwas, Malgorzata60th IEEE Conference on Decision and Control, CDC 2021, Austin, 13-17 December 20212021 / p. 4594-4601 https://doi.org/10.1109/CDC45484.2021.9682853 Conference proceedings at Scopus Article at Scopus Article at WOS

Accessibility and system reduction of nonlinear time-delay control systemsBartosiewicz, Zbigniew; Kaldmäe, Arvo; Kawano, Yu; Kotta, Ülle; Pawluszewicz, Ewa; Simha, Ashutosh; Wyrwas, MałgorzataIEEE Transactions on Automatic Control2021 / p. 3781−3788 https://doi.org/10.1109/TAC.2020.3028566 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Accessibility conditions of MIMO nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Tõnso, Maris; Wyrwas, MałgorzataMathematical control and related fields2016 / p. 217-250 https://doi.org/10.3934/mcrf.2016002 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Algebraic formalism of differential one-forms for nonlinear control systems on time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Pawluszewicz, Ewa; Wyrwas, MałgorzataProceedings of the Estonian Academy of Sciences. Physics. Mathematics2007 / 3, p. 264-282

Algebraic formalism of differential p-forms and vector fields for nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Pawluszewicz, Ewa; Tõnso, Maris; Wyrwas, MałgorzataProceedings of the Estonian Academy of Sciences2013 / p. 215-226 https://doi.org/10.3176/proc.2013.4.02 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Comments on "PBH tests for nonlinear systems"Sarafrazi, Mohammad Amin; Bartosiewicz, Zbigniew; Kotta, ÜlleAutomatica2020 / art. 108617 https://doi.org/10.1016/j.automatica.2019.108617 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Equivalence of linear control systems on time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Pawluszewicz, EwaProceedings of the Estonian Academy of Sciences. Physics. Mathematics2006 / 1, p. 43-52

Finite determination of accessibility and singular points of nonlinear systems: an algebraic approachSarafrazi, Mohammad Amin; Kotta, Ülle; Bartosiewicz, ZbigniewSystems & control letters2020 / art. 104600, p. 1−7 https://doi.org/10.1016/j.sysconle.2019.104600 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Forward and backward shifts of vector fields : towards the dual algebraic frameworkMullari, Tanel; Kotta, Ülle; Bartosiewicz, Zbigniew; Pawluszewicz, Ewa; Moog, ClaudeIEEE transactions on automatic control2017 / p. 3029-3033 https://doi.org/10.1109/TAC.2016.2608718 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Nabla derivatives associated with nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Mullari, Tanel; Tõnso, Maris; Pawluszewicz, Ewa; Wyrwas, MałgorzataNonlinear analysis : modelling and control2016 / p. 547-563 https://doi.org/10.15388/NA.2016.4.8 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

On accessibility conditions for state space nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Mullari, Tanel; Tõnso, Maris; Wyrwas, MałgorzataSystems & control letters2016 / p. 8-13 https://doi.org/10.1016/j.sysconle.2016.09.018 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

On the finiteness of accessibility test for nonlinear discrete-time systemsSarafrazi, Mohammad Amin; Pawluszewicz, Ewa; Bartosiewicz, Zbigniew; Kotta, ÜlleInternational journal of control2021 / p. 2330-2336 https://doi.org/10.1080/00207179.2019.1706102 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

On the stopping criteria in nonlinear unknown input observability conditionSarafrazi, Mohammad Amin; Kotta, Ülle; Bartosiewicz, ZbigniewIEEE transactions on automatic control2022 / p. 4733-4737 https://doi.org/10.1109/TAC.2022.3160133 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

On the transformation of a nonlinear discrete-time input-output system into the strong row-reduced formBartosiewicz, Zbigniew; Belikov, Juri; Kotta, Ülle; Tõnso, Maris; Wyrwas, MałgorzataProceedings of the Estonian Academy of Sciences2016 / p. 220-236 https://doi.org/10.3176/proc.2016.3.02 https://artiklid.elnet.ee/record=b2798394*est Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Popov form and the explicit equations of inverse systemsBartosiewicz, Zbigniew; Kotta, Ülle; Pawluszewicz, Ewa; Tõnso, Maris; Wyrwas, MałgorzataProceedings of the Estonian Academy of Sciences2018 / p. 432-355 : ill http://www.kirj.ee/public/proceedings_pdf/2018/issue_4/proc-2018-4-342-355.pdf https://doi.org/10.3176/proc.2018.4.04 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Reducibility condition for nonlinear discrete-time systems : behavioral approachBartosiewicz, Zbigniew; Kotta, Ülle; Pawłuszewicz, Ewa; Tõnso, Maris; Wyrwas, MałgorzataControl and Cybernetics2013 / p. 329-346 https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=d858f3fd9c2acd98e41f35a0bed4c0cb9efab59c Journal metrics at Scopus Article at Scopus

Relations between modules associated to input-output nonlinear equations with delays and their realizationsBartosiewicz, Zbigniew; Kaldmäe, Arvo; Kotta, Ülle; Wyrwas, Malgorzata62nd IEEE Conference on Decision and Control, CDC 2023, Singapore, 13-15 December 20232023 / p. 644-650 https://doi.org/10.1109/CDC49753.2023.10383927 Conference proceedings at Scopus Article at Scopus Article at WOS

Stability and stabilizability of linear time-delay systems on homogeneous time scalesBelikov, Juri; Bartosiewicz, ZbigniewProceedings of the Estonian Academy of Sciences2017 / p. 124-136 https://doi.org/10.3176/proc.2017.2.02 http://www.ester.ee/record=b2355998*est https://artiklid.elnet.ee/record=b2820925*est Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

State feedback linearization of nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Belikov, Juri; Kotta, Ülle; Wyrwas, MałgorzataNonlinear analysis: hybrid systems2019 / p. 69-85 https://doi.org/10.1016/j.nahs.2018.08.002 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Static state feedback linearization of nonlinear control systems on homogeneous time scalesBartosiewicz, Zbigniew; Kotta, Ülle; Tõnso, Maris; Wyrwas, MałgorzataMathematics of control, signals, and systems2015 / p. 523-550 https://doi.org/10.1007/s00498-015-0150-5 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

A test for the generic strong-accessibility of meromorphic nonlinear systemsCarravetta, Francesco; Sarafrazi, Mohammad Amin; Bartosiewicz, Zbigniew; Kotta, ÜlleIEEE transactions on automatic control2020 / p. 867-873 https://doi.org/10.1109/TAC.2019.2921645 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Testing generic strong accessibility of nonlinear control systems via polynomial (quadratic) immersionCarravetta, Francesco; Sarafrazi, Mohammad Amin; Bartosiewicz, Zbigniew; Kotta, Ülle61st IEEE Conference on Decision and Control, CDC 2022, Cancun, 6 December - 9 December 2022, proceedings2022 / p. 1841-1846 https://doi.org/10.1109/CDC51059.2022.9992952 Conference Proceedings at Scopus Article at Scopus Article at WOS

The concepts of Lie derivative for discrete-time systemsMullari, Tanel; Kotta, Ülle; Bartosiewicz, Zbigniew; Pawluszewicz, EwaProceedings of the Estonian Academy of Sciences2012 / p. 253-265 : ill

The strong Popov form of nonlinear input–output equationsBartosiewicz, Zbigniew; Pawluszewicz, Ewa; Wyrwas, Małgorzata; Kotta, Ülle; Tõnso, MarisProceedings of the Estonian Academy of Sciences2018 / p. 193–206 https://doi.org/10.3176/proc.2018.3.01 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Transforming a set of nonlinear input-ouput equations into Popov formBartosiewicz, Zbigniew; Kotta, Ülle; Pawluszewicz, Ewa; Tõnso, Maris; Wyrwas, Małgorzata2015 54th IEEE Conference on Decision and Control (CDC) : date: 15-18 Dec. 20152015 / p. 7131 - 7136 https://doi.org/10.1109/CDC.2015.7403344 Conference Proceedings at Scopus Article at Scopus Article at WOS

Weak reachability and controllability of discrete-time nonlinear systems: generic approach and singular pointsMullari, Tanel; Kotta, Ülle; Bartosiewicz, Zbigniew; Sarafrazi, Mohammad Amin; Moog, Claude; Pawluszewicz, EwaInternational journal of control2020 / p. 483-489 https://doi.org/10.1080/00207179.2018.1479076 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS