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4. “PV Power Systems: Quantitative Technology Scenarios, and Science and Technology Roadmap based on Elemental Technology Structure”. Strategy for technology development, proposal paper for policy making and governmental action toward low carbon societies, Center for Low Carbon Society Strategy, Japan Science and Technology Agency (2014.3)
5. Koyama M, Kimura S, Kikuchi Y, Nakagaki T, Itaoka K (2014) Present status and points of discussion for future energy systems in Japan from the aspects of technology options. J Chem Eng Jpn 47:499–513