%0 Journal Article %A Adam ParusiƄski %A Armin Rainer %T Sobolev Lifting over Invariants %J Symmetry, integrability and geometry: methods and applications %D 2021 %V 17 %U http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a36/ %G en %F SIGMA_2021_17_a36