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2. Infinite abelian groups;Fuchs,1973
3. On the theory of generalized nilpotent linear groups;Garaščuk;Dokl. Akad. Nauk BSSR,1960
4. Zur Erweiterungstheorie der endlichen Gruppen;Gaschütz;J. reine angew. Math.,1952
5. Cohomological topics in group theory;Gruenberg,1970