@article{ZNSL_1991_193_a9,
     author = {D. V. Fomin},
     title = {Stiefel orientations: existence and constructions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {149--160},
     publisher = {mathdoc},
     volume = {193},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_193_a9/}
}