@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/}
}