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@article{DAN_1978_239_4_a3, author = {Yu. L. Ershov}, title = {Valuations of skew fields and the group $SK_1$}, journal = {Doklady Akademii Nauk}, pages = {768--771}, publisher = {mathdoc}, volume = {239}, number = {4}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_4_a3/} }
Yu. L. Ershov. Valuations of skew fields and the group $SK_1$. Doklady Akademii Nauk, Tome 239 (1978) no. 4, pp. 768-771. http://geodesic.mathdoc.fr/item/DAN_1978_239_4_a3/