Gerdjikov V.S.Grahovski G.G.Mikhailov A.V.Valchev T.I.2024-07-102024-07-102024-07-102024-07-102011-06-010040-57791573-933310.1007/s11232-011-0058-2SCOPUS_ID:79960093480https://rlib.uctm.edu/handle/123456789/218We analyze and compare methods for constructing the recursion operators for a special class of integrable nonlinear differential equations related to symmetric spaces of the type A. III in Cartan's classification and having additional reductions. © 2011 Pleiades Publishing, Ltd.enArticle