S. Bjelić and G. Popović, “Flexibility Equipment of Protection, Control and Measure for Mean and Low Electrical Network in Power Transformation Substations”, ELEKTRON ELEKTROTECH, vol. 92, no. 4, pp. 27–32, Apr. 2009, Accessed: Jan. 23, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/10220