%0 Journal Article %A A. V. Zhiber %A A. B. Shabat %T Systems of equations $u_x=p(u,\,v)$, $v_y=q(u,\,v)$ that possess symmetries %J Doklady Akademii Nauk %D 1984 %P 29-33 %V 277 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1984_277_1_a5/ %G ru %F DAN_1984_277_1_a5