@article{SIGMA_2012_8_a33,
     author = {Ernie G. Kalnins and Willard Miller Jr.},
     title = {Structure theory for extended {Kepler{\textendash}Coulomb} {3D} classical superintegrable systems},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a33/}
}