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2. H. P. Manning, Irrational Numbers, Wiley, New York, 1906.
3. Ueber die Werthver�nderungen bedingt convergenter Reihen und Producte
4. W. Rudin, Principles of Mathematical Analysis, 2nd, ed., McGraw-Hill, New York, 1964.
5. E. T. Whittaker and G. N. Watson, A Course of Modern Analysis, Amer. ed., Cambridge University Press, 1943.