@article{CMH_1968__43_139356,
     author = {Francois Sigrist},
     title = {Groupes d'homotopie des vari\'et\'es de {Stiefel} complexes.},
     journal = {Commentarii mathematici Helvetici},
     pages = {121--131},
     publisher = {mathdoc},
     volume = {43},
     year = {1968},
     zbl = {0167.51702},
     url = {http://geodesic.mathdoc.fr/item/CMH_1968__43_139356/}
}