@article{JGG_2016_20_2_JGG_2016_20_2_a2,
     author = {P. Daugulis and V. Vagale },
     title = {Normal {Forms} of {Triangles} and {Quadrangles} up to {Similarity}},
     journal = {Journal for geometry and graphics},
     pages = {173--184},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2016},
     url = {http://geodesic.mathdoc.fr/item/JGG_2016_20_2_JGG_2016_20_2_a2/}
}