1. Cartan, H.: Periodicité des groups d'homotopie stable des groups classiques, d'apres Bott. Séminaire Henri Cartan, Ecole N. Sup., 1959/60.
2. Cartan, H., Eilenberg, S.: Homological algebra. Princeton University Press 1956.
3. Eilenberg, S., MacLane, S.: On the groupsH(?,n), II. Ann. of Math.70, 49?139 (1954).
4. Hilton, P.: Homotopy theory and duality. New York: Gordon and Breach 1965.
5. James, I., Thomas, E.: An approach to the enumeration problem. J. Math. Mech.14, 485?506 (1965).