Document Zbl 0309.31006

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Acta techn. Acad. Sci. Hungar. 75, 3-11 (1973).

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scan of Zbl 0309.31006

31A30	Biharmonic, polyharmonic functions and equations, Poisson’s equation in two dimensions
31A05	Harmonic, subharmonic, superharmonic functions in two dimensions

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