@article{AA_2006_18_4_a3,
     author = {Dang Khanh Hoi},
     title = {On the structure of the set of periods for periodic solutions of some linear integro-differential equations on the multidimensional sphere},
     journal = {Algebra i analiz},
     pages = {83--94},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2006_18_4_a3/}
}