TY - JOUR AU - John R. Stallings TI - Surfaces in Three-Manifolds and Non-Singular Equations in Groups. JO - Mathematische Zeitschrift PY - 1983 SP - 1 EP - 18 VL - 184 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZ_1983__184_173342/ ID - MZ_1983__184_173342 ER -