Eigenfunction expansions of functions describing systems with symmetries. Kachuryk, Ivan; Klimyk, Anatoliy — 2007 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
On orthogonality relations for dual discrete q -ultraspherical polynomials. Groza, Valentyna A.; Kachuryk, Ivan I. — 2006 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]