共 50 条
- [12] END EXTENSIONS WHICH ARE MODELS OF A GIVEN THEORY ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, 1977, 23 (05): : 463 - 467
- [16] U-EXTENSIONS OF COUNTABLE STRUCTURES NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (05): : 752 - &
- [17] COUNTABLE EXTENSIONS OF TORSION ABELIAN GROUPS ARCHIVUM MATHEMATICUM, 2005, 41 (03): : 265 - 272
- [20] ON COUNTABLE EXTENSIONS OF PRIMARY ABELIAN GROUPS ARCHIVUM MATHEMATICUM, 2007, 43 (01): : 61 - 66