%0 Journal Article %A O. L. Vinogradov %T Sharp inequalities for the second modulus of continuity of periodic functions and of functions extended from the segment %J Zapiski Nauchnykh Seminarov POMI %D 1996 %P 33-49 %V 232 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1996_232_a2/ %G ru %F ZNSL_1996_232_a2