References
- H. Kober, Dictionary of conformal representations. Dover Publications, Inc. New York (1952).
- Ruel V. Churchill, Complex variables and applications, Chapter 1. McGraw-Hill Book Co., Inc. New York. Second Ed. (1960).
- Walter B. Carver, The conjugate coordinate system for plane Euclidean geometry, Slaught Memorial Paper, Number 5, Amer. Math. Monthly, 63, No. 9, (November 1956).