@article{SIGMA_2021_17_a36,
     author = {Adam Parusi\'nski and Armin Rainer},
     title = {Sobolev {Lifting} over {Invariants}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a36/}
}