%0 Journal Article %A N. P. Lazarev %T Differentiation of the energy functional for the problem of the equilibrium of a body containing a crack, with Signorini boundary conditions %J Sibirskij žurnal industrialʹnoj matematiki %D 2002 %P 139-147 %V 5 %N 2 %U http://geodesic.mathdoc.fr/item/SJIM_2002_5_2_a10/ %G ru %F SJIM_2002_5_2_a10