%0 Journal Article %A %D 2014 %J Current Research in Agricultural Sciences %@ 2312-6418 %V 1 %N 2 %P 42-52 %T Development of a Mathematical Model for Angle of Soil Failure Plane in Case of 3-Dimenssional Cutting %M %U http://www.pakinsight.com/archive/68/06-2014/2