1. Sums of automorphisms of a primary abelian group;Castagna;Pacific J. Math.,1968
2. On endomorphisms of primary abelian groups;Freedman;J. London Math. Soc.,1968
3. Infinite Abelian Groups I;Fuchs,1970
4. Infinite Abelian Groups II;Fuchs,1973
5. Recent results and problems on abelian groups;Fuchs,1963