@article{CMH_1965__40_139302,
     author = {Donald W. Kahn},
     title = {The {Spectral} {Sequence} of a {Postnikov} {System.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {169--198},
     year = {1965},
     volume = {40},
     zbl = {0148.43404},
     url = {http://geodesic.mathdoc.fr/item/CMH_1965__40_139302/}
}