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Methodical notes
A simple proof of the mean-value theorem for harmonic functions
B. P. Demidovich
Citation:
B. P. Demidovich, “A simple proof of the mean-value theorem for harmonic functions”, Russian Math. Surveys, 9:3 (1954)
Linking options:
https://www.mathnet.ru/eng/rm8100 https://www.mathnet.ru/eng/rm/v9/i3/p213
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