Ireneusz Andrzej Grządzielski, Mikołaj Zakrzewski, Volodymyr Konoval. “Simulation Tests of the Power System Defence Process at a Decrease in Frequency – Implementation of the NC ER/2017 Code Recommendations”. Acta Energetica, no. 04 (December 31, 2019): 54–61. Accessed April 29, 2024. https://www.actaenergetica.org/index.php/journal/article/view/78.