Nevanlinna function (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nevanlinna function" in English language version.

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See for example Section 4, "Poisson representation" in Louis de Branges (1968). Hilbert Spaces of Entire Functions. Prentice-Hall. ASIN B0006BUXNM. De Branges gives a form for functions whose real part is non-negative in the upper half-plane.