³ . -

г 2007
67
,
Ѳ ' ײ ز ˲Ͳ $2b$-˲ в
$ u_t+\sum\limits_{|\alpha|=2}D_x^{\alpha}(a_{\alpha}(z,t,u,D_xu,D^2_xu))- \sum\limits_{|\beta|=1}D_z^{\beta}(b_{\beta}(z,t,u,D_zu))+c(z,t,u)=f. $ ', '.
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