5Itasca Consulting Group Inc. FLAC - Fast Lagrangian analysis of continua [R]. Version 3. 30, 1995.
6Cundall P. A.. Explicit finite difference methods in geomechanics[J]. Numerical Methods in Engineering (Proc, of the EF Conference on Numerical Methods in Geomechanics, Blacksburg,VA), 1993 (1).