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@article{MZ_1981__178_173121, author = {Robert Switzer}, title = {Counting {Elemnts} in {Homotopy} {Sets.}}, journal = {Mathematische Zeitschrift}, pages = {527--554}, publisher = {mathdoc}, volume = {178}, year = {1981}, zbl = {0498.55006}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173121/} }
Robert Switzer. Counting Elemnts in Homotopy Sets.. Mathematische Zeitschrift, Tome 178 (1981), pp. 527-554. http://geodesic.mathdoc.fr/item/MZ_1981__178_173121/