@article{CMH_1961__35_139202,
     author = {Tudor Ganea},
     title = {Fibrations and {Cocategory.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {15--24},
     publisher = {mathdoc},
     volume = {35},
     year = {1961},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMH_1961__35_139202/}
}