[1] F. W. Anderson, K. R. Fuller: Rings and categories of modules. Springer-Verlag, New York-Heidslberg-Berlin, 1974. MR 0417223 | Zbl 0301.16001

[2] L. Bican T. Kepka, P. Němec: Rings, modules, and preradicals. M. Dekker Inc., New York-Basel, 1982. MR 0655412

[3] H. Cartan, S. Eilenberg: Homological algebra. Princeton University Press, Princeton, 1956. MR 0077480 | Zbl 0075.24305

[4] S. E. Dickson: A torsion theory for abelian categories. Trans. Amer. Math. Soc. 121 (1966), 223-235. DOI 10.1090/S0002-9947-1966-0191935-0 | MR 0191935 | Zbl 0138.01801

[5] P. C. Eklof: Homological algebra and set theory. Trans. Amer. Math. Soc. 227 (1977), 207--225. DOI 10.1090/S0002-9947-1977-0453520-X | MR 0453520 | Zbl 0355.02047

[6] B. J. Gardner: Rings whose modules form few torsion classes. Bull. Austral. Math. Soc. 4 (1971), 355-359. DOI 10.1017/S0004972700046700 | MR 0280547 | Zbl 0209.07304

[7] K. R. Goodearl: Von Neumann regular rings. Pitman, London-San Francisco-Melbourne, 1979. MR 0533669 | Zbl 0411.16007

[8] P. Jambor: An orthogonal theory of a set-valued bifunctor. Czech. Math. J. 23 (1973), 447-454. MR 0338123 | Zbl 0271.18010

[9] P. Jambor: Hereditary tensor-orthogonal theories. Comment. Math. Univ. Carolinae 16 (1975), 139-145. MR 0399149 | Zbl 0303.16011

[10] S. Shelah: A compactness theorem for singular cardinals, free algebras. Whitehead problem and transversals. Israel J. Math. 21 (1975), 319-349. DOI 10.1007/BF02757993 | MR 0389579 | Zbl 0369.02034

[11] J. Trlifaj, T. Kepka: Structure of T-rings. in Radical Theory (Proc. Conf. Eger, 1982), Colloq. Math. Soc. Bolyai, North-Holland, Amsterdam, (to appear). MR 0899130