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