[1] S. A. AMITSUR: A general theory of radicals II. Radicals in rings and bicategories. Amer. J. Math. 76 (1954), 100-125. MR 0059256

[2] R. BAER: Die Torsionsuntergruppe einer abelschen Gruppe. Math. Ann. 135 (1958), 219-234. MR 0100024 | Zbl 0081.25704

[3] R. A. BEAUMONT R. S. PIERCE: Torsion-free rings. Illinois J. Math. 5 (1961), 61-98. MR 0148706

[4] R. A. BEAUMONT R. S. PIERCE: Quasi-isomorphism of p-groups. pp. 13-27 of Proceedings of the Colloquium on Abelian Groups, Tihany, 1963, Akadémiai Kiadó, Budapest, 1964. MR 0172920

[5] S. E. DICKSON: On torsion classes of abelian groups. J. Math. Soc. Japan 17 (1965), 30-35. MR 0185001 | Zbl 0131.02404

[6] S. E. DICKSON: A torsion theory for abelian categories. Trans. Amer. Math. Soc. 121 (1966), 223-235. MR 0191935 | Zbl 0138.01801

[7] D. W. DUBOIS: Cohesive groups and p-adic integers. Publ. Math. Debrecen 12 (1965), 51-58. MR 0220823 | Zbl 0136.29002

[8] J. ERDÖS: On direct decompositions of torsion free abelian groups. Publ. Math. Debrecen 3 (1954), 281-288. MR 0072132

[9] L. FUCHS: Abelian Groups. Akadémiai Kiadó, Budapest, 1958. Zbl 0091.02704

[10] L. FUCHS: Infinite Abelian Groups Vol. I. Academic Press, New York and London, 1970. MR 0255673 | Zbl 0209.05503

[11] B. J. GARDNER: Torsion classes and pure subgroups. Pacific J. Math. 33 (1970), 109-116. MR 0260867 | Zbl 0177.04203

[12] B. J. GARDNER: A note on types. Bull. Austral. Math. Soc. 2 (1970), 275-276. MR 0258950 | Zbl 0186.32703

[13] B. J. GARDNER: Radicals of abelian groups and associative rings. (submitted). Zbl 0234.16003

[14] B. J. GARDNER: Some remarks on radicals of rings with chain conditions. (submitted). Zbl 0234.16004

[15] A. G. KUROŠ: Radikaly kolec i algebr. Matem. Sb. 33 (1953), 13-26. MR 0057236

[16] A. G. KUROŠ: Radikaly v teorii grupp. Sibirskij Mstem. 2. 3 (1962), 912-931.

[17] Ju. M. RJABUCHIN: Radikaly v kategorijach. Matem. Issled. Kišinev 2 Vyp. 3 (1967), 107-165.