Robinson Sinaga, Siti Anisah, and Dian Yulis Wulandari, “Analysis of Load Imbalance in 20 kV/400 V Distribution Transformers at PT PLN (Persero) Siantar Kota ULP Operational Area Robinson Sinaga, Siti Anisah, Dian Yulis Wulandari ”, ICEEGLOF, pp. 1485–1494, Feb. 2026.