Иванов, Вадим Борисович, Мартин Рихтер, and Виктор Иванович Ситас. 2012. “On the Question of the Comparative Effectiveness of Vacuum Tube and Variable-Frequency Drives”. Eastern-European Journal of Enterprise Technologies 3 (10(57):32-35. https://doi.org/10.15587/1729-4061.2012.4180.