Isotropic oscillator in the space of constant positive curvasture. Interbasis expansions / Ye.M.Hakobyan,G.S.Pogosyan,A.N.Sissakian,S.I.Vinisky, 1997. - 22 p. - Текст : непосредственный.
On a generalized oscillator: invariance algebra and interbasis expansions / Ye.M.Hakobyan,M.Kibler,G.S.Pogosyan,A.N.Sissakian, 1997. - 12 p. - Текст : непосредственный.