Yoko Sakakihara, Yoshihiro Kabeyama, Hiroshi Kanasaki, Kazushi Hamada, Shinichiro Okazaki, Kenji Wada, and Ichiro Ishimaru. “CHLORIDE ION MEASUREMENT SYSTEM FOR RC STRUCTURE BY NEAR-INFRARED SPECTROSCOPY”. GEOMATE Journal, vol. 19, no. 71, July 2020, pp. 48-54, https://geomatejournal.com/geomate/article/view/816.