6Maheshwari P. , Madhav M. R.. Analysis of a rigid footing lying on three-layered soil using the finite difference method [ J ]. Geotechnical and Geological Engineering, 2006, 24 ( 4 ) : 851 - 869.
7Barry J. C. Programming in FISh [ J ]. International Journal on Software Tools for Technology Transfer, 1999, 2( 3 ) : 307 -315.