@article{SIGMA_2009_5_a7,
     author = {Ernest G. Kalnins and Jonathan M. Kress and Willard Miller Jr. and Sarah Post},
     title = {Structure {Theory} for {Second} {Order} {2D} {Superintegrable} {Systems} with {1-Parameter} {Potentials}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2009},
     volume = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a7/}
}