@article{SIGMA_2021_17_a32,
     author = {\"Orn Arnaldsson and Francis Valiquette},
     title = {Invariants of {Surfaces} in {Three-Dimensional} {Affine} {Geometry}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a32/}
}