Osadchuk, S. V., and V. A. Osadchuk. “Research of a Frequency Magnetic Converter on the Basis of Transistor Structure With Negative Resistance”. Elektronika Ir Elektrotechnika, vol. 21, no. 3, Apr. 1999, https://eejournal.ktu.lt/index.php/elt/article/view/16532.