386 BIBLIOGRAPHY

[24] Rudin, W., Principles of mathematical analysis, McGraw Hill third edition 1976

[25] Rudin W., Real and Complex Analysis, third edition, McGraw-Hill, 1987.

[26] Widder, D. Advanced Calculus, second edition, Prentice Hall 1961.

[27] Zygmund A.. Trigonometric Series, Volume I and II, Cambridge University Press1968.