Les classes d'équivalence rationnelle, I
Séminaire Claude Chevalley, Volume 3 (1958), Talk no. 2, 14 p. 
@article{SCC_1958__3__A2_0,
     author = {Chevalley, Claude},
     title = {Les classes d'\'equivalence rationnelle, I},
     journal = {S\'eminaire Claude Chevalley},
     publisher = {Secr\'etariat math\'ematique},
     volume = {3},
     year = {1958},
     note = {talk:2},
     language = {fr},
     url = {http://www.numdam.org/item/SCC_1958__3__A2_0}
}

Chevalley, Claude. Les classes d'équivalence rationnelle, I. Séminaire Claude Chevalley, Volume 3 (1958) Talk no. 2, 14 p. http://www.numdam.org/item/SCC_1958__3__A2_0/