@article{10_4153_CJM_1972_039_5,
     author = {Strutt, Joseph},
     title = {Projective {Homotopy} {Classes} of {Stiefel} {Manifolds}},
     journal = {Canadian journal of mathematics},
     pages = {465--476},
     year = {1972},
     volume = {24},
     number = {3},
     doi = {10.4153/CJM-1972-039-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-039-5/}
}