TY - JOUR AU - Michael D. O'Neill TI - Vertical variation of harmonic functions in upper half-spaces JO - Colloquium Mathematicum PY - 2001 SP - 1 EP - 12 VL - 87 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm87-1-1/ DO - 10.4064/cm87-1-1 LA - en ID - 10_4064_cm87_1_1 ER -