On the Boundary Condition ${{\Partial U} \Mathord{\left/ {\Vphantom {{\Partial U} {\Partial N}}} \Right. \Kern-\Nulldelimiterspace} {\Partial N}} + Au = 0$ for Harmonic Functions
Bulletin of the American Mathematical Society
doi 10.1090/s0002-9904-1938-06780-8
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Date
June 1, 1938
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American Mathematical Society (AMS)