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References
M. Essén, Lectures on the cosπλ-theorem. University of Kentucky 1973.
M. Heins, Selected topics in the classical theory of a complex variable. Holt, Rinehart and Winston, New York 1962.
J.L. Lewis, Some theorems on the cosπλ-inequality, Trans. of the AMS 167 (1972), 171–189.
F. Norstad, Convexity of the mean-value of certain subharmonic functions (in Swedish). Manuscript 1970.
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Essén, M. (1974). A differential inequality with applications to subharmonic functions. In: Sleeman, B.D., Michael, I.M. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 415. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0065518
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DOI: https://doi.org/10.1007/BFb0065518
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