TY - JOUR AU - A. Lévy TI - Principles of reflection in axiomatic set theory JO - Fundamenta Mathematicae PY - 1960 SP - 1 EP - 10 VL - 49 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-49-1-1-10/ DO - 10.4064/fm-49-1-1-10 LA - en ID - 10_4064_fm_49_1_1_10 ER -