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M Ojaveer, V Sarv. "ОБМЕН ЭНЕРГИИ МЕЖДУ ГАРМОНИКАМИ В КЛЮЧАХ РЕГУЛЯТОРА ПЕРЕМЕННОГО НАПРЯЖЕНИЯ ПРИ ВЫСОКОЧАСТОТНОЙ ШИРОТНО-ИМПУЛЬСНОЙ МОДУЛЯЦИИ. I." Proceedings of the Academy of Sciences of the Estonian SSR. Physics. Mathematics 28.1 (1979) 48