1. Amitsur, S. A.: General theory of radicals II: Radicals in rings and bicategories. Amer. J. Math. 76, 100–125 (1954).
2. Anderson, T., N. Divinski, and A. Sulinski: Lower radical properties for associative and alternative rings (to appear).
3. Cartan, H., and S. Eilenberg: Homological algebra. Princeton: Princeton University Press 1956.
4. Dickson, S.: A torsion theory for abelian categories (to appear: Trans. Amer. Math. Soc.).
5. — Decomposition of modules I: Classical rings (to appear: Math. Z.).