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@article{AL_1985_24_5_a0, author = {Yu. L. Ershov}, title = {$\Sigma$-predicates of finite types over an admissible set}, journal = {Algebra i logika}, pages = {499--536}, publisher = {mathdoc}, volume = {24}, number = {5}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1985_24_5_a0/} }
Yu. L. Ershov. $\Sigma$-predicates of finite types over an admissible set. Algebra i logika, Tome 24 (1985) no. 5, pp. 499-536. http://geodesic.mathdoc.fr/item/AL_1985_24_5_a0/