@incollection{AST_1984__113-114__167_0,
     author = {Brown, Ronald},
     title = {Non-abelian cohomology and the homotopy classification of maps},
     booktitle = {Homotopie alg\'ebrique et alg\`ebre locale},
     series = {Ast\'erisque},
     pages = {167--172},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {113-114},
     year = {1984},
     zbl = {0548.55018},
     mrnumber = {749052},
     language = {en},
     url = {http://www.numdam.org/item/AST_1984__113-114__167_0/}
}