1. Underground High Voltage Electricity Transmission Line;Grid,2015
2. Underground Electric Transmission Line;Wisconsin,1992
3. O.D. Cambodia, "National Strategic Development Plan (NSDP) " 2019–2023.
4. Automated underground residential distribution design. Part I: conceptual design;Sumic;IEEE Trans. Power Del.,1993
5. Automated underground residential distribution design. Part2: prototype implementation and results;Sumic;IEEE Trans. Power Del.,1993