// <I>ELMA 2019<D> : 16th International conference on "Electrical machines, drives and power systems ELMA 2019", Varna, Bulgaria, 6-8 june 2019 : IEEE Proc. - Sofia, 2019, p. 398-401, Art. № 8771477, DOI: 10.1109/ELMA.2019.8771477.
B. Evstatiev; K. Gabrovska-Evstatieva; V. Voinohovska;
I. Beloev и др.