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      One-relator groups and proper 3-realizability 

      Cárdenas Escudero, Manuel Enrique; Fernández Lasheras, Francisco Jesús; Quintero Toscano, Antonio Rafael; Repovš, Dušan (European Mathematical Society, 2009)
      How different is the universal cover of a given finite 2-complex from a 3-manifold (from the proper homotopy viewpoint)? ...