@article{10_4153_CMB_1984_019_x,
     author = {Trew, S. and Zvengrowski, P.},
     title = {Non-Parallelizability of {Grassmann} {Manifolds}},
     journal = {Canadian mathematical bulletin},
     pages = {127--128},
     year = {1984},
     volume = {27},
     number = {1},
     doi = {10.4153/CMB-1984-019-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1984-019-x/}
}