5FREDLUND D G,MORGENSTERN N R.Stress state variables for unsaturated soils[J].J Geotech Engrg Div,ASCE,1977,103:447 - 466.
6FREDLUND D G,MORGENSTERN N R,WIDGER R A.The shear strength of unsaturated soils[J].Can Geotech J,1978,15(3):313 - 321.
7ZIENKIEWICZ O C,HUMPHESON C,LEWIS R W.Associated and non-associated visco-plasticity and plasticity in soil mechanics[J].Geotechnique,1975,25(4):671 - 689.
8MATSUI T,SAN K C.Finite element slope stability analysis by shear strength reduction technique[J].Soils Found,1992,32(1):59 - 70.
9GRIFFITHS D V,LANE P A.Slope stability analysis by finite elements[J].Geotechnique,1999,49(3):387 - 403.
10DAWSON E M,ROTH W H,DRESCHER A.Slope stability analysis by strength reduction[J].Geotechnique,1999,49(6):835 - 840.
