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2. An Introduction to the Geology of Ceylon;Cooray,1967
3. Discussion on the load deformation behaviour of the Middle Chalk at Mundford, Norfolk. In-Situ Investigations in Soils and Rocks;Fookes,1970
4. Suggested method for determining pointload strength;Int. Soc. Rock Mech.;Int. J. Rock Mech., Miner. Sci. Geomech. Abst.,1985
5. Application of present indices of chemical weathering for Precambrian metamorphic rocks in Sri Lanka;Jayawardena,1992