An Analysis of Energy Efficiency Using DEA: A Comparison of Korean and Japanese Economic Regions
Jayeol Ku

Zero-Carbon Energy Kyoto 2009 Green Energy and Technology, 2010, Part III, (i), 90-95, DOI: 10.1007/978-4-431-99779-5_13
http://www.springerlink.com/content/kv227q13l07nxq70/