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@article{AL_1992_31_3_a1, author = {Yu. L. Ershov}, title = {Boolean families of valuation rings}, journal = {Algebra i logika}, pages = {276--296}, publisher = {mathdoc}, volume = {31}, number = {3}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1992_31_3_a1/} }
Yu. L. Ershov. Boolean families of valuation rings. Algebra i logika, Tome 31 (1992) no. 3, pp. 276-296. http://geodesic.mathdoc.fr/item/AL_1992_31_3_a1/