Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1965__1_4_a1, author = {Havel, V\'aclav}, title = {Uniongraph der {Familie} von {Zerlegungen} in einer {Menge}}, journal = {Archivum mathematicum}, pages = {217--220}, publisher = {mathdoc}, volume = {01}, number = {4}, year = {1965}, mrnumber = {0194347}, zbl = {0192.04803}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/ARM_1965__1_4_a1/} }
Havel, Václav. Uniongraph der Familie von Zerlegungen in einer Menge. Archivum mathematicum, Tome 01 (1965) no. 4, pp. 217-220. http://geodesic.mathdoc.fr/item/ARM_1965__1_4_a1/