@article{MM2_1986__57_155198,
     author = {Maria H. Paula Leite Mello},
     title = {Two-Plane {Sub-Bundles} of nonorientable real vector-bundles.},
     journal = {Manuscripta mathematica},
     pages = {263--280},
     publisher = {mathdoc},
     volume = {57},
     year = {1986},
     zbl = {0602.55009},
     url = {http://geodesic.mathdoc.fr/item/MM2_1986__57_155198/}
}