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@article{AL_1993_32_3_a2, author = {Yu. L. Ershov}, title = {Boolean families of valuation {rings.~II}}, journal = {Algebra i logika}, pages = {261--266}, publisher = {mathdoc}, volume = {32}, number = {3}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1993_32_3_a2/} }
Yu. L. Ershov. Boolean families of valuation rings.~II. Algebra i logika, Tome 32 (1993) no. 3, pp. 261-266. http://geodesic.mathdoc.fr/item/AL_1993_32_3_a2/