%0 Journal Article %A Michael D. O'Neill %T Vertical variation of harmonic functions in upper half-spaces %J Colloquium Mathematicum %D 2001 %P 1-12 %V 87 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm87-1-1/ %R 10.4064/cm87-1-1 %G en %F 10_4064_cm87_1_1