Comments on “When retarded nonlinear time-delay systems admit an input–output representation of neutral type” [Automatica 49 (2013) 561–567]Kaldmäe, ArvoAutomatica2023 / art. 110797, 2 p https://doi.org/10.1016/j.automatica.2022.110797 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS A note on observability of nonlinear discrete-time systemsKaldmäe, Arvo; Kotta, Ülle2023 62nd IEEE Conference on Decision and Control (CDC), Singapore, 13-15 December 20232023 / p. 7483-7488 https://doi.org/10.1109/CDC49753.2023.10383709 Conference proceedings at Scopus Article at Scopus Article at WOS Observable space of the nonlinear control system on a homogeneous time scaleKaparin, Vadim; Kotta, Ülle; Wyrwas, MałgorzataProceedings of the Estonian Academy of Sciences2014 / p. 11-25 https://artiklid.elnet.ee/record=b2665198*est https://doi.org/10.3176/proc.2014.1.04 Journal metrics at Scopus Article at Scopus Journal metrics at Scopus Article at WOS Observer-based residual generation for nonlinear discrete-time systemsKaldmäe, Arvo; Kotta, ÜlleProceedings of the Estonian Academy of Sciences2018 / p. 325-336 https://doi.org/10.3176/proc.2018.4.01 http://www.kirj.ee/public/proceedings_pdf/2018/issue_4/proc-2018-4-325-336.pdf Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS On integrability of observable space for discrete-time analytic systemsKawano, Yu; Kotta, Ülle2015 54th IEEE Conference on Decision and Control (CDC) : date: 15-18 Dec. 20152015 / p. 7137 - 7142 https://doi.org/10.1109/CDC.2015.7403345 Conference Proceedings at Scopus Article at Scopus 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 Optimal placement of branch PMUs for specified redundancy and line observabilityTuttelberg, Kaur; Kilter, Jako2015 IEEE Power & Energy Society General Meeting (PESGM 2015) : Denver, CO, USA, July 26-30, 20152015 / [5] p. : ill http://dx.doi.org/10.1109/PESGM.2015.7286453 A tool set for teaching design-for-testability of digital circuitsKostin, Sergei; Orasson, Elmet; Ubar, Raimund-JohannesEWME 2016 : 11th European Workshop on Microelectronics Education : May 11-13, 2016, Southampton, UK2016 / [6] p. : ill https://doi.org/10.1109/EWME.2016.7496466