%0 Journal Article %A M. R. Fel'dman %T Stability of orthotropic plates with stepwise variable stiffness %J Doklady Akademii Nauk %D 1961 %P 1086-1089 %V 137 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1961_137_5_a21/ %G ru %F DAN_1961_137_5_a21