Kochukov, Olegs, Anna Mutule, Zigurds Krishans, and Irina Oleinikova. “Model for Technical-Economic Analysis of ENTSO-E and IPS UPS Power System Optimal Interconnection Concepts”. Electrical, Control and Communication Engineering 28, no. 1 (January 1, 2011): 15–18. Accessed November 5, 2024. https://ecce-journals.rtu.lv/ecce/article/view/v10144-011-0002-1.