Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1956__15_1_114765, author = {Bartholomay, A.F.}, title = {The {Serre} group $E_2^{p,q}$}, journal = {Portugaliae mathematica}, pages = {31--34}, publisher = {mathdoc}, volume = {15}, number = {1}, year = {1956}, mrnumber = {0081898}, zbl = {0072.17903}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1956__15_1_114765/} }
Bartholomay, A.F. The Serre group $E_2^{p,q}$. Portugaliae mathematica, Tome 15 (1956) no. 1, pp. 31-34. http://geodesic.mathdoc.fr/item/PORMA_1956__15_1_114765/