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31. The more or less standard definition of the error function employed here can be found in M. Abramowitz and I. A. Stegun, Eds., Handbook of Mathematical Functions, 297, Dover, New York, 1972.

32. Sansone, G. and J. Gerretsen, Lectures on the Theory of Functions of a Complex Variable. I. Holomorphic Functions, 221-227, P. Noordhoff-Groningen, The Netherlands, 1960.