1. Dynamics of Fluids in Porous Media;Bear,1972
2. Drainage and Flow Nets;Cedergren,1967
3. Thermodynamics;Müller,1985
4. Geotechnik––Bodenmechanik und Grundbau;Kolymbas,1998
5. Wilhelm, Th., 2000. Piping in Saturated Granular Media, Ph.D. Thesis, University of Innsbruck ftp://ftp.uibk.ac.at/pub/uni-innsbruck/igt/publications/_wilhelm/phd_thesis_wilhelm.pdf