@article{10_4153_CJM_1970_030_9,
     author = {Perles, M. A. and Sallee, G. T.},
     title = {Cell {Complexes,} {Valuations,} and the {Euler} {Relation}},
     journal = {Canadian journal of mathematics},
     pages = {235--241},
     year = {1970},
     volume = {22},
     number = {2},
     doi = {10.4153/CJM-1970-030-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-030-9/}
}