Bjelić, S., and G. Popović. “Flexibility Equipment of Protection, Control and Measure for Mean and Low Electrical Network in Power Transformation Substations”. Elektronika ir Elektrotechnika 92, no. 4 (April 19, 2009): 27-32. Accessed November 21, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/10220.