TY - JOUR AU - Robin Heinonen AU - Ernest G. Kalnins AU - Willard Miller Jr. AU - Eyal Subag TI - Structure Relations and Darboux Contractions for 2D 2nd Order Superintegrable Systems JO - Symmetry, integrability and geometry: methods and applications PY - 2015 VL - 11 UR - http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a42/ LA - en ID - SIGMA_2015_11_a42 ER -