@incollection{AST_1976__32-33__113_0,
     author = {Bott, Raoul},
     title = {On characteristic classes in the framework of {Gelfand-Fuks} cohomology},
     booktitle = {Colloque analyse et topologie},
     series = {Ast\'erisque},
     pages = {113--139},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {32-33},
     year = {1976},
     mrnumber = {402768},
     zbl = {0328.57005},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1976__32-33__113_0/}
}