@article{SG_1957__1__A3_0, author = {Cartier, Pierre}, title = {Les groupes $\mathrm {Ext}^s (A,B)$}, journal = {S\'eminaire A. Grothendieck}, note = {talk:3}, publisher = {Secr\'etariat math\'ematique}, volume = {1}, year = {1957}, language = {fr}, url = {http://www.numdam.org/item/SG_1957__1__A3_0/} }