1. Lecture notes in mathematics;J.F. Adams,1969
2. Araki, S., Toda, H.: Multiplicative structures in modq cohomology theories. Osaka J. Math.2, 70?115 (1965).
3. Bourbaki, N.: Eléments de mathématiques, Algèbre Ch. 2 (Algèbre Linéaire). Paris: Hermann 1962.
4. Brown, E.: Cohomology theories. Ann. of Math.75, 467?484 (1962).
5. Fuchs, L.: Abelian groups. Budapest: Publishing house of the Hungarian academy of sciences 1958.