follows
Existence d'isogénies, I
@article{SCC_1956-1958__2__A11_0, author = {Chevalley, C.}, title = {Existence d'isog\'enies, {II}}, journal = {S\'eminaire Claude Chevalley}, note = {talk:24}, pages = {1--6}, publisher = {Secr\'etariat math\'ematique}, volume = {2}, year = {1956-1958}, language = {fr}, url = {http://www.numdam.org/item/SCC_1956-1958__2__A11_0/} }
Chevalley, C. Existence d'isogénies, II. Séminaire Claude Chevalley, Volume 2 (1956-1958), Talk no. 24, 6 p. http://www.numdam.org/item/SCC_1956-1958__2__A11_0/