Sauhats, Antans, Andrejs Utans, Gregory Pashnin, and Dmitrijs Antonovs. “Out-of-Step Relays Testing Procedure”. Electrical, Control and Communication Engineering 28, no. 1 (January 1, 2011): 9–14. Accessed March 7, 2026. https://ecce-journals.rtu.lv/ecce/article/view/v10144-011-0001-2.