Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1952__11_1_114695, author = {Bott, Raoul}, title = {Two new combinatorial invariants for polyhedra}, journal = {Portugaliae mathematica}, pages = {35--40}, publisher = {mathdoc}, volume = {11}, number = {1}, year = {1952}, mrnumber = {0048820}, zbl = {0047.42003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1952__11_1_114695/} }
Bott, Raoul. Two new combinatorial invariants for polyhedra. Portugaliae mathematica, Tome 11 (1952) no. 1, pp. 35-40. http://geodesic.mathdoc.fr/item/PORMA_1952__11_1_114695/