I. Rankis, L. Ribickis, and A. Vitols, “Comparison of Two Solutions of Regeneration Circuits for Tramcars”, ELEKTRON ELEKTROTECH, vol. 69, no. 5, pp. 53–56, May 2006, Accessed: Jan. 22, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/10677