Ya-Chu Chiu, Tai-Tien Wang, and Tsan-Hwei Huang. “State-of-the Art of the Tunnel Maintenance in Taiwan and Challenges to Sustainable Development”. Geotechnical Engineering Journal of the SEAGS & AGSSEA, vol. 47, no. 2, Oct. 2024, pp. 7-13, doi:10.14456/seagj.2016.37.