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Lau C . H ., . Some physical properties of soils. pp. 93-102. ISSN 0032-096X
Soong N . K ., . and Lau C . H ., . and Tan K . S ., . (1984) Seasonal changes in humic substances in soils under different vegetative covers. In: International Conference on Soils and Nutritional of Perennial Crops, 13-15 Aug 1984, Kuala Lumpur (Malaysia).