References
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- Miles , J. and Williamson , J. 1986 . A characterization of the exponential function . J. London Math. Soc. , 33 ( 2 ) : 110
- Rudin , W. 1986 . Real and Complex Analysis , New York : McGraw-Hill Book Company .
- Titchmarsh , F. C. 1939 . The Theory of Functions , London : Oxford University Press .