For citations:

Dang K.B., Pyrkin A.A., Bobtsov A.A., Vedyakov A.A., Nizovtsev S.I. Output Adaptive Observers Design for Linear Non-Stationary Systems with Polynomial Parameters. Mekhatronika, Avtomatizatsiya, Upravlenie. 2021;22(8):404-410. (In Russ.) https://doi.org/10.17587/mau.22.404-410