@article{MZM_1973_13_2_a16,
     author = {A. A. Bel'skii},
     title = {Integral rings of groups of period two and generalizations of {Witt} rings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {311--315},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_2_a16/}
}