1. 1"Symposium on the Engineering Aspects of the Physico-Chemical Properties of Clays, and Acta Swineford "; pp.12 -218 inClays and Clay Minerals-Proceedings of the Ninth National Conference on Clays and Clay Minerals, 1960 . Pergamon Press, Inc., New York, 1962 .
2. 2C. M. A. Bruijn , "Thermodynamics of Expansive Soils: III ," C.S.I.R. Special Report No. D5, Pretoria, South Africa;27 pp., 1963 .