MathSciNet bibliographic data MR924767 31B05 (41A30 41A50) Goldstein, Myron; Haussmann, Werner; Rogge, Lothar On the mean value property of harmonic functions and best harmonic \$L\sp 1\$$L\sp 1$-approximation. Trans. Amer. Math. Soc. 305 (1988), no. 2, 505–515. Article

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