3-Manifolds that are covered by two open Bundles

J. C. Gomez-Larranaga, W. Heil, F. Gonzalez-Acuna

We obtain a list of all closed 3-manifolds that are covered by two open submanifolds, each homeomorphic to an open disk over S¹, or an open I-bundle over the 2-sphere, the projective plane, the torus, or the Klein bottle.