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- [4] DIFFERENCES OF RECURSIVELY-ENUMERABLE SETS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1985, (08): : 3 - 12
- [9] ON THE COMPLEXITY OF SEPARATION OF RECURSIVELY-ENUMERABLE SETS DOKLADY AKADEMII NAUK SSSR, 1982, 267 (06): : 1300 - 1304
- [10] RECURSIVELY-ENUMERABLE L-SETS ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, 1987, 33 (02): : 107 - 113