1. P. Ramond, Field Theory: A Modern Primer, Addison-Wesley, Reading, MA, 1994.
2. W. Rudin, Principles of Mathematical Analysis, 3rd edition, McGraw-Hill, New York, NY, 1976.
3. M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables, Dover, New York, NY, 1972.