O. V. Chernoyarov, Y. A. Kutoyants, and M. Marcokova, “Errata: Communications – Scientific Letters of the University of Zilina, Vol. 20, No.1, 2018, „On Frequency Estimation for Partially Observed System with Small Noises in State and Observation Equations“, pp. 67-72.”, Communications, vol. 20, no. 2, p. 126, Jun. 2018.