@article{SIGMA_2011_7_a47,
     author = {\'Angel Ballesteros and Alberto Enciso and Francisco J. Herranz and Orlando Ragnisco and Danilo Riglioni},
     title = {Superintegrable {Oscillator} and {Kepler} {Systems} on {Spaces} of {Nonconstant} {Curvature} via the {St\"ackel} {Transform}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2011},
     volume = {7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2011_7_a47/}
}