Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1958__136_160646, author = {H. Hopf and F. Hirzebruch}, title = {Felder von {Fl\"achenelementen} in 4-dimensionalen {Mannigfaltigkeiten.}}, journal = {Mathematische Annalen}, pages = {156--172}, publisher = {mathdoc}, volume = {136}, year = {1958}, zbl = {0088.39403}, url = {http://geodesic.mathdoc.fr/item/MAN_1958__136_160646/} }
H. Hopf; F. Hirzebruch. Felder von Flächenelementen in 4-dimensionalen Mannigfaltigkeiten.. Mathematische Annalen, Tome 136 (1958), pp. 156-172. http://geodesic.mathdoc.fr/item/MAN_1958__136_160646/