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2) Bishop, A.W. and Bjerrum, L. (1960): "The relevance of the triaxial test to the solution of stability problems," ASCE, Research Conference on Shear Strength of Cohesive Soils, Boulder, Colorado, pp. 437-501.
3) Brooker, E.W. and Ireland, H.O. (1965): "Earth pressures at rest related to stress history," Canadian Geotechnical J. Vol.2, No.1, pp. 1-15.