%0 Journal Article %A M. N. Yakovlev %T Periodic solutions of second-order systems with one-sided restrictions to the growth of the right-hand side with respect to the first derivative %J Zapiski Nauchnykh Seminarov POMI %D 1992 %P 190-203 %V 202 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1992_202_a11/ %G ru %F ZNSL_1992_202_a11