1. 1 JOGMEC: 日本の地熱発電, https://geothermal.jogmec.go.jp/information/plant_japan/index.html [JOGMEC: Nippon no Chinetsu Hatsuden.]
2. 2 経済産業省資源エネルギー庁: 2050 年カーボンニュートラルに向けた地熱をとりまく現状について, 2020, https://www.meti.go.jp/shingikai/energy_environment/carbon_neutral/pdf/001_05_00.pdf [Agency for Natural Resources and Energy, Ministry ofEconomy, Trade and Industry: 2050 Nen Carbon Neutral ni Muketa Chinetsu wo TorimakuGenjo ni Tsuite, 2020]
3. 3 Oil and Gas Journal: Advances in Drill Bit Technology, (PennWell Corporation, Tulsa,Oklahoma, 2006), pp.10-12.
4. 4 D. W. Raymond, S. Knudsen, D. Blankenship, S. Bjornstad, J. Barbour and A. Schen: Geotherm. Resour. Counc. Trans. 36 (2012), 307-315.
5. 5 M. Sabri, A. H. James, K. Matthew, K. Gabor, T. Colton, Y. Ariatama and H. Rifki: Proc.4th Indonesia Int. Geothermal Convention & Exhibition (2016), paper No. ENG46.