TY - JOUR AU - Murray Bell TI - Tightness and π-character in centered spaces JO - Colloquium Mathematicum PY - 1999 SP - 297 EP - 307 VL - 80 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-80-2-297-307/ DO - 10.4064/cm-80-2-297-307 LA - en ID - 10_4064_cm_80_2_297_307 ER -