@article{CMH_1970__45_139442,
     author = {James A. Schafer},
     title = {Topological {Pontrjagin} {Classes.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {315--332},
     publisher = {mathdoc},
     volume = {45},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139442/}
}