%0 Journal Article %A Ghori, Q.K. %T Equations of motion of nonlinear nonholonomic systems with variable masses %J Portugaliae mathematica %D 1988 %P 49-58 %V 45 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115607/ %G en %F PORMA_1988__45_1_115607