Quantum deformations and superintegrable motions on spaces with variable curvature. Ragnisco, Orlando; Ballesteros, Ángel; Herranz, Francisco J.; Musso, Fabio — 2007 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Superintegrable oscillator and Kepler systems on spaces of nonconstant curvature via the Stäckel transform. Ballesteros, Ángel; Enciso, Alberto; Herranz, Francisco J.; Ragnisco, Orlando; Riglioni, Danilo — 2011 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]