@article{MZM_1993_53_2_a15,
     author = {A. A. Tuganbaev},
     title = {Quaternion algebras over commutative rings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {126--131},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_2_a15/}
}