%0 Journal Article %A Robin Heinonen %A Ernest G. Kalnins %A Willard Miller Jr. %A Eyal Subag %T Structure Relations and Darboux Contractions for 2D 2nd Order Superintegrable Systems %J Symmetry, integrability and geometry: methods and applications %D 2015 %V 11 %U http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a42/ %G en %F SIGMA_2015_11_a42