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- [4] ENDOMORPHISMS OF COUNTABLE DIRECT SUMS OF TORSION COMPLETE GROUPS ACTA MATHEMATICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1972, 23 (1-2): : 45 - 50
- [7] On the decomposition of countable Abelian groups without torsion into direct sums of groups of the first rank COMPTES RENDUS DE L ACADEMIE DES SCIENCES DE L URSS, 1939, 24 : 12 - 14