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@article{TM_1970_113_a3, author = {R. I. Freidson}, title = {A~certain characterization of the complexity of recursive predicates}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {79--101}, publisher = {mathdoc}, volume = {113}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1970_113_a3/} }
R. I. Freidson. A~certain characterization of the complexity of recursive predicates. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of the constructive direction in mathematics. Part 5, Tome 113 (1970), pp. 79-101. http://geodesic.mathdoc.fr/item/TM_1970_113_a3/