%0 Journal Article %A Bardenhagen, S.G. %A Guilkey, J.E. %A Roessig, K.M. %A Brackbill, J.U. %A Witzel, W.M. %A J.C.Foster, %D 2001 %J Computer Modeling in Engineering \& Sciences %@ 1526-1506 %V 2 %N 4 %P 509--522 %T An Improved Contact Algorithm for the Material Point Method and Application to Stress Propagation in Granular Material %M doi:10.3970/cmes.2001.002.509 %U http://www.techscience.com/CMES/v2n4/24749