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1 Richards, K. S., "True triaxial piping test apparatus for evaluation of piping potential in earth structures" 33 (33): 83-95, 2010
2 "Standard test method for permeability testing of granular soils (constant head), Annual Book of ASTM Standards, Vol. 4.08"
3 The Ministry of Water Resources of the People’s Republic of China (MWRPRC), "Specification of seepage and seepage deformation test for coarse grained soil (SL237-058-1999)" China Water Power Press 1999
4 Honjo, Y., "Self-filtration behaviour of broadly and gap-graded cohesionless soils" BiTech Publishers 227-236, 1996
5 Tanaka, T., "Seepage-failure experiments on multi-layered sand columns" 31 (31): 13-36, 1991
6 Li M., "Seepage induced instability in widely graded soils" The University of British Columbia 2008
7 Tomlinson, S. S., "Seepage forces and confining pressure effects on piping erosion" 37 (37): 1-13, 2000
8 Gimenez, D., "Scaling properties of saturated hydraulic conductivity in soil" 88 (88): 205-220, 1999
9 Schulze-Makuch, D., "Scale dependency of hydraulic conductivity in heterogeneous media" 37 (37): 904-919, 1999
10 Louis, C., "Rock hydraulics in rock mechanics" Verlag Wien 1974
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