%0 Journal Article %A O. A. Veliev %A A. A. Shkalikov %T On the Riesz Basis Property of the Eigen- and Associated Functions of Periodic and Antiperiodic Sturm--Liouville Problems %J Matematičeskie zametki %D 2009 %P 671-686 %V 85 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2009_85_5_a3/ %G ru %F MZM_2009_85_5_a3