%0 Journal Article
%A Gryshchuk, S. V.
%D 2018
%F zu2:28475
%J Recherches sur les d´eformations
%K the generalized Hook’s law, a plane orthotropy, the equilibrium  system
%N 2
%P 71-76
%T On some cases of plane orthotropy
%U http://eprints.zu.edu.ua/28475/
%V LXVIII
%X There are considered some cases of plane orthotropy in the absence of body forces. Then  every function from a pair-solution of the equilibrium system of equations with respect to  displacements satisfies the elliptic fouth-order equation of the type:  �  �