Fredlund, D. G. (Delwyn G.), Soil mechanics for unsaturated soils D. G. Fredlund, H. Rahardjo - New York Wiley 1993 - 517 pages : illusration ; 29 cm. p. 490-507 ISBN: 047185008X Subjects--Topical Terms: Soil mechanicsSoil moistureSoil--Testing