1. 1) Japan Ship Technology Research Association: Research and development of ultra-high precision hull structure digital twin 2019 report of results, 2020. (in Japanese)
2. 日本船舶技術研究協会：超高精度船体構造デジタルツインの研究開発 2019 年度成果報告書，2020．
3. 2) Fujikubo, M：R&D of Digital Twin for Ship Structures - Outcome of Phase-1 Project and its Future Extension-， Conference Proceedings of Japan Society of Naval Architects and Ocean Engineers, Vol. 30，pp 205-208， 2020．
4. 3) Nishida, H, Ueda, R, Iijima, K, Fujikubo, M: Real-time estimation of structural deformation of large ships for navigation decision support, Proceedings of TEAM2017, Osaka, CD-ROM．
5. 4) Iijima, K, Tatsumi, A, Fujikubo, M: Global Deformation Estimation of Ship Structure by Using Sensors and Numerical Model, Conference Proceedings of Japan Society of Naval Architects and Ocean Engineers, Vol. 30, pp.221-227, 2020．