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N. Jacobson: Basic Algebra I, II, W. H. Freeman and Company, New York,1974. 3. M. Atiyah, I. Macdonald: Introduction to Commutative Algebra, Addison-Wesley Publishing Co., Reading, Mass.-London-Don Mills, Ont. 1969. 4. Hideyuki Matsumura, Commutative algebra. Second edition. Mathematics Lecture Note Series, 56. Benjamin/Cummings Publishing Co., Inc., Reading, Mass., 1980. 5. S. I. Gelfand, Y. I. Manin: Methods of Homological Algebra,  HYPERLINK "http://www.ams.org/mathscinet/search/series.html?cn=Springer_Monographs_in_Mathematics" Springer Monographs in Mathematics. Springer-Verlag, Berlin, 2003. 6. H. Cartan, S. Eilenberg: Homological Algebra, Princeton University Press, Princeton, N. J., 1956. 7. J. P. Serre: Linear Representations of Finite Groups, Graduate Texts in Mathematics, vol. 42, Springer-Verlag, New York, Heidelberg, Berlin, 1977.     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