@article{GDZPPN002332914, title = {Singular points of a convex tiling.}, journal = {Mathematische Annalen}, volume = {283}, year = {1989}, pages = {601-616}, zbl = {0662.52008}, url = {http://dml.mathdoc.fr/item/GDZPPN002332914} }
Nielsen, Mark J. Singular points of a convex tiling.. Mathematische Annalen, Tome 283 (1989) pp. 601-616. http://gdmltest.u-ga.fr/item/GDZPPN002332914/