@article{10_4153_CMB_1975_039_3,
     author = {Duggal, K. L.},
     title = {On the {Spheres} {Carrying} an {Almost} {Contingent} {Structure}},
     journal = {Canadian mathematical bulletin},
     pages = {195--201},
     year = {1975},
     volume = {18},
     number = {2},
     doi = {10.4153/CMB-1975-039-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-039-3/}
}