@article{PMIHES_1973__42__5_0,
     author = {Friedlander, Eric M.},
     title = {Fibrations in etale homotopy theory},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--46},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {42},
     year = {1973},
     mrnumber = {366929},
     zbl = {0351.55011},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1973__42__5_0/}
}