1. Chen, J. and Abe, N. (1999) Site classification for Sugi plantations using GIS. J. For. Plann. 5:1-8
2. Goshima, M., Shuin, Y., Tasaka, T., Aruga, K., Matsue, K. and Naito, K. (2008) Relation between shallow landslide on hill slopes and distribution of soil depth, soil structure in Funyu forest, Utsunomiya University. Bull. Utsunomiya Univ. For. 44: 15-32.
3. Hiroshima, T. and Nakajima, T. (2009) Extracting old-growth planted stands suitable for clear cutting and reforestation using GIS. Kanto J. For. Res. 60: 43-46.
4. Kato, S. (1967) Studies on the forest road system: Preliminary report on the road density. Bull. Tokyo Univ. For. 63: 215-233.
5. Kawata, S. and Matsumura, N. (2006) Forest management system conducted by forest zoning procedure and official support for private forests: Applicability of GIS for Sugi plantation forests in Misugi Village, Mie Prefecture. Jpn. J. For. Plann. 40: 57-63.