TY - JOUR AU - Joel Hass AU - Roger Schlafly TI - Double bubbles minimize JO - Annals of mathematics PY - 2000 VL - 151 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.2307/121042/ DO - 10.2307/121042 ID - 10_2307_121042 ER -