Kouhei Sawa
- (1973): Identification of Quantities of Coloured Minerals and Degrees of Weathering Using Representation Method of MASA (Decomposed Granite Soils) Colour. Dans: Soils and Foundations, v. 13, n. 1 (mars 1973).
- (1972): The Identification of Weathering Patterns and their Representation Methods Based on Observations of Broken Surface on Decomposed Granites. Dans: Soils and Foundations, v. 12, n. 4 (décembre 1972).
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