1. 1) K. Uesugi and M. Tonoike, NEW GLASS, 25(4), 33–37 (2010) [in Japanese].
2. 2) S. Sakka, T. Sakaino and K. Takahashi, “Glass Handbook”, Asakura Syoten (1975) p. 10; p. 17 [in Japanese].
3. 3) T. Mori, “Historical Development of Flat Glass Manufacturing Technologies”, Survey Reports on the Systemization of Technologies, National Science Museum, 9, 119–168 (2007), http://sts.kahaku.go.jp/diversity/document/system/pdf/035.pdf [in Japanese].
4. 4) Agency for Natural Resources and Energy, “Annual Report on Energy, 2020 (Energy White Paper 2021)” (2021), https://www.enecho.meti.go.jp/about/whitepaper/2021/pdf/2_1.pdf [in Japanese].
5. 5) Glass Industry Conference of Japan, “Glass White Paper”, http://www.gic.jp/hakusho/01.html [in Japanese].