%0 Journal Article %A A. K. Rybnikov %T Special connections that determine the zero curvature representation for second-order evolution equations %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1999 %P 32-41 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1999_9_a4/ %G ru %F IVM_1999_9_a4