Simeonova, Tsvetelina, and Alex Velkov. “Application of Wood Structures for the Analysis of the Electrical Chain in a Sinusoidal and Periodical Non-Sinusoidal Mode of Work”. Yearbook Telecommunications 5 (September 20, 2018): 93–107. Accessed June 10, 2025. https://ojs.nbu.bg/index.php/YT/article/view/136.