@article{SIGMA_2012_8_a104,
     author = {Ernie Kalnins and George S. Pogosyan and Alexander Yakhno},
     title = {Separation of {Variables} and {Contractions} on {Two-Dimensional} {Hyperboloid}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a104/}
}