1. M. Abramowitz and I. A. Stegun,Handbook of Mathematical Functions, Dover Publications, Inc., New York, 1968, p. 18, § 3.9.6.
2. L. V. Ahlfors,Complex Analysis, McGraw-Hill, New York, 1953, pp. 15, 46, and 48.
3. T. M. Apostol,Mathematical Analysis, Addison-Wesley, 1960, pp. 201, 385, 502.
4. T. M. Apostol,Introduction to Analytic Number Theory, Springer-Verlag, New York, Heidelberg, Berlin, 1976, pp. 62–64.
5. A Simple Proof that, For Odd p > 1, arc cos1/p and π are Incommensurable