Shinya Inazumi, Hsin Ming Shang, Yoshihiro Nakagishi, and Hideo Kawabata. “CHARACTERISTICS OF WATER-SWELLING FRICTION REDUCING MATERIALS ON THE PULLING-OUT REMOVAL OF TEMPORARY WORKS”. GEOMATE Journal, vol. 6, no. 12, June 2014, pp. 910-8, https://geomatejournal.com/geomate/article/view/2936.