1) Procter, R. R.: Four Articles on the design and construction of rolled-earth dams, Eng. News Record, Vol.111, pp.245-248, 286-289, 348-351, 372-376, 1933.
2) Seed, H. B. and Chan, C. K.: Structure and strength characteristics of compacted clays, Journal of SMFD, Proc. ASCE, SM5, pp.87-125, 1959.