@incollection{AST_1984__113-114__234_0,
     author = {Legrand, A.},
     title = {$\pi_1$ et $d_2$},
     booktitle = {Homotopie alg\'ebrique et alg\`ebre locale},
     series = {Ast\'erisque},
     pages = {234--237},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {113-114},
     year = {1984},
     zbl = {0548.55014},
     mrnumber = {749062},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1984__113-114__234_0/}
}