Tetsuoh Shirota, Chizuru Iwasaki, Tetsuo Okano, and Shinjiro Oya. 2021. “NATURAL REGENERATION AND ARTIFICIAL THINNING FOR EARLY FOREST RESTORATION ON A PERMANENTLY CLOSED SKI SLOPE”. GEOMATE Journal 20 (82):115-20. https://geomatejournal.com/geomate/article/view/166.