%0 Journal Article %A Dang Khanh Hoi %T On the structure of the set of periods for periodic solutions of some linear integro-differential equations on the multidimensional sphere %J Algebra i analiz %D 2006 %P 83-94 %V 18 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2006_18_4_a3/ %G ru %F AA_2006_18_4_a3