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Contractions of Lie algebras and separation of variables. The n-dimensional sphere / A.A.Izmest'ev,G.S.Pogosyan,A.N.Sissakian,P.Winternitz, 1998. - 36 p. - Текст : непосредственный.
Contractions of lie algebras and separation of variables / A.A.Izmest'ev,G.S.Pogosyan,A.N.Sissakian,P.Winternitz, 1996. - 15 p. - Текст : непосредственный.