2) Kawakami, H.: Landslide Risk Mapping by Quantification Method, Proc. IV ISL, Toront, Vol.2, 1984
3) Fujita, T.: Slope Analysis of Landslides in SHIKOKU, Japan, proc. I. S. L., New Delhi, 1980
4) Styles, K. A. et. al.: (Hong Kong Geotechnical Control Office.) Terrain Classincation Methods for Development planning & Geotechnical Appraisal: A Hong Kong Case. IV International symposium on Landslides, Toront 1984. Vol.1. pp.561-568