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@article{AL_1973_12_4_a0, author = {Yu. L. Ershov}, title = {Theory of $A$-spaces}, journal = {Algebra i logika}, pages = {369--416}, publisher = {mathdoc}, volume = {12}, number = {4}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1973_12_4_a0/} }
Yu. L. Ershov. Theory of $A$-spaces. Algebra i logika, Tome 12 (1973) no. 4, pp. 369-416. http://geodesic.mathdoc.fr/item/AL_1973_12_4_a0/