tips of points: An free general cost structure analysis theory to students of permutation alarm. Tuganbaev, Semidistributive Modules and Rings. Kluwer Academic Publishers, Dordrecht-Boston-London, 1998. Van der Waerden, Algebra I, II. Springer-Verlag, Berlin-Heidelberg-New York, 1967 - 1971. Weiss, Algebraic Number Theory. International Series in Pure and Applied Mathematics, McGraw-Hill Book Company, New York-San FranciscoToronto, 1963. Wisbauer, Foundations of Module and Ring Theory. Gordon and Breach, Philadelphia, 1991. Samuel, Commutative Algebra, I, II. Graduate Texts in Mathematics, Vol. 28, 29, Springer-Verlag, Berlin-Heidelberg-New York, 1975.

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