@article{SIGMA_2012_8_a30,
     author = {Andrey V. Tsiganov},
     title = {Superintegrable {St\"ackel} systems on the plane: elliptic and parabolic coordinates},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a30/}
}