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- [3] On groups with specific sub-groups COMPTES RENDUS DE L ACADEMIE DES SCIENCES DE L URSS, 1938, 18 : 9 - 10
- [5] Have the sub-groups of the serological group A transitions between sub-groups A (1) and A(2)? COMPTES RENDUS DES SEANCES DE LA SOCIETE DE BIOLOGIE ET DE SES FILIALES, 1931, 106 : 578 - 580
- [7] GROUPS WITH FREE NONABELIAN SUB-GROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1970, 17 (03): : 552 - &