@article{MS2_1984__55_166915,
     author = {S. Halperin and Y. Felix and J.-C. Thomas},
     title = {Sur l'homotopie des espaces de categorie 2.},
     journal = {Mathematica Scandinavica},
     pages = {216--228},
     publisher = {mathdoc},
     volume = {55},
     year = {1984},
     zbl = {0537.55012},
     url = {http://geodesic.mathdoc.fr/item/MS2_1984__55_166915/}
}