2The senior author is affiliated with CSIRO Division of Environmental Mechanics, Canberra, Australia. The junior author is with the Laboratory of Soils and Fertilizers, State Agricultural University, Wageningen, Netherlands. The authors gratefully acknowledge the stimulating discussions with Dr. J. R. Philip on the subject which took place during the junior author's stay at the Laboratory of the Division of Environmntal Mechanics of CSIRO, Canberra, during 1970.
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Groenevelt et al. (1972) studied this question.