Kota Kono, Akihisa Nakahashi, and Ryoichi Fukagawa. “CALCULATION FORMULA FOR PULLOUT RESISTANCE EXERTED BYOPEN-WING-TYPE GROUND ANCHOR”. GEOMATE Journal, vol. 16, no. 58, June 2019, pp. 110-5, https://geomatejournal.com/geomate/article/view/2723.