@article{PMIHES_1973__42__5_0,
     author = {Eric M. Friedlander},
     title = {Fibrations in etale homotopy theory},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--46},
     year = {1973},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {42},
     doi = {10.1007/BF02685876},
     mrnumber = {366929},
     zbl = {0351.55011},
     language = {en},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02685876/}
}