@book{AST_1976__40_,
     author = {Collectif},
     title = {International conference on dynamical systems in mathematical physics},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1976},
     language = {mul},
     url = {http://www.numdam.org/item/AST_1976__40_/}
}