Shpak, Olexandr. «ANALYSIS OF POWER TRANSFORMER IMPACT ON STEADY-STATE MODE OF ELECTRIC GRID BASED ON CAUCHY EQUATION». Scientific Works of Vinnytsia National Technical University, no. 4 (Березень 22, 2017). дата звернення Червень 20, 2026. https://works.vntu.edu.ua/index.php/works/article/view/489.