1. Ali S. ( 1993). “Engineering properties of undisturbed samples of Boston blue clay ” PhD thesis University of Illinois at Urbana-Champaign Ill.
2. Asaoka A. (1978). “Observational procedure of settlement prediction.” Soils and Found. 18(4) 87–101.
3. Casagrande A. and Fadum R. E. ( 1940). “Notes on soil testing for engineering purposes.” Publication 268 Graduate School of Engineering Harvard University Cambridge Mass.
4. Cepeda-Diaz A. F. ( 1987). “An experimental investigation of the engineering behavior of natural shales ” PhD thesis University of Illinois at Urbana-Champaign Ill.
5. Choi Y. K. ( 1982). “Consolidation behavior of natural clays ” PhD thesis University of Illinois at Urbana-Champaign Ill.