@article{CMH_1968__43_139353,
     author = {James Stasheff},
     title = {More {Characteristic} {Classes} for {Spherical} {Fibre} {Spaces.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {78--86},
     publisher = {mathdoc},
     volume = {43},
     year = {1968},
     zbl = {0153.53501},
     url = {http://geodesic.mathdoc.fr/item/CMH_1968__43_139353/}
}