TY - JOUR AU - Joel Hass TI - Surface Minimizing Area in Their Homology Class and Group Actions on 3-Manifolds. JO - Mathematische Zeitschrift PY - 1988 SP - 501 EP - 510 VL - 199 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173982/ ID - MZ_1988__199_1_173982 ER -