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當舎 利行. "5.3 地熱(5. 自然エネルギー,II エネルギー資源の利用技術の進展と研究動向,平成23年における重要なエネルギー関係事項)." Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy 91.8 (2012) 757-758