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@article{CMH_1949__22_138958, author = {Th. Motzkin and B. Bernheim}, title = {A criterion for divisibility of n-gons into k-gons.}, journal = {Commentarii mathematici Helvetici}, pages = {93--102}, publisher = {mathdoc}, volume = {22}, year = {1949}, zbl = {0031.17601}, url = {http://geodesic.mathdoc.fr/item/CMH_1949__22_138958/} }
Th. Motzkin; B. Bernheim. A criterion for divisibility of n-gons into k-gons.. Commentarii mathematici Helvetici, Tome 22 (1949), pp. 93-102. http://geodesic.mathdoc.fr/item/CMH_1949__22_138958/