@article{SIGMA_2021_17_a14,
     author = {Andreas Vollmer},
     title = {St\"ackel {Equivalence} of {Non-Degenerate} {Superintegrable} {Systems,} and {Invariant} {Quadrics}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a14/}
}