MathSciNet bibliographic data MR719001 (85f:43016) 43A85 (22E30 31B05 33A75) Ahern, Patrick R.; Johnson, Kenneth D. Differentiability criteria and harmonic functions on \$B\sp{n}\$$B\sp{n}$. Proc. Amer. Math. Soc. 89 (1983), no. 4, 709–712. Article

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