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2. and , ‘Stress-strain models for frictional materials’, Massachusetts Institute of Technology, Department of Civil Engineering, Report R 70-18, ( 1970).
3. and , ‘Finite element analysis of elasto-plastic soils’, Massachusetts Institute of Technology, Department of Civil Engineering, Report R 72-21, 1972.
4. On The Yielding of Soils
5. Yielding of Clays in States Wetter than Critical