@incollection{AST_1981__82-83__1_0,
     author = {AST},
     title = {Pages pr\'eliminaires},
     booktitle = {Caract\'eristique d'Euler-Poincar\'e - S\'eminaire E.N.S. 1978-1979},
     series = {Ast\'erisque},
     pages = {1--6},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {82-83},
     year = {1981},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1981__82-83__1_0/}
}