@incollection{AST_1990__191__97_0,
     author = {Dwyer, William G. and Wilkerson, Clarence W.},
     title = {Spaces of null homotopic maps},
     booktitle = {Th\'eorie de l'homotopie},
     editor = {Miller H.-R. and Lemaire J.-M. and Schwartz L.},
     series = {Ast\'erisque},
     pages = {97--108},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {191},
     year = {1990},
     mrnumber = {1098969},
     zbl = {0731.55009},
     language = {en},
     url = {http://www.numdam.org/item/AST_1990__191__97_0/}
}