@article{GDZPPN002055104, title = {A criterion for divisibility of n-gons into k-gons.}, journal = {Commentarii mathematici Helvetici}, volume = {22}, year = {1949}, pages = {93-102}, zbl = {0031.17601}, url = {http://dml.mathdoc.fr/item/GDZPPN002055104} }
Motzkin, Th.; Bernheim, B. A criterion for divisibility of n-gons into k-gons.. Commentarii mathematici Helvetici, Tome 22 (1949) pp. 93-102. http://gdmltest.u-ga.fr/item/GDZPPN002055104/