References
- Jong-UK Sue, "[ZENER HEIM] Guidebook," 2010.
- Jong-UK Sue, "[GREEN PREMIUM] Tech source book," 2010.
- Chun-Sik Yoo, "Comprehension of green energy and sunlight generation system," 2009.
- National energy council and all of the department dedicated to energy, "The first base national energy plan 2008-2030," 2008.
- Energy economics institute, "2011 Energy Consumption Survey," 2011.