@article{ZNSL_1978_75_a11,
     author = {V. I. Kopeiko},
     title = {Quadratic spaces and quaternion algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {110--120},
     publisher = {mathdoc},
     volume = {75},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_75_a11/}
}