MathSciNet bibliographic data MR1154440 57N10 (20F32 57M05 57M20) Stallings, John R.; Gersten, S. M. Casson's idea about $3$$3$-manifolds whose universal cover is ${\bf R}\sp 3$${\bf R}\sp 3$. Internat. J. Algebra Comput. 1 (1991), no. 4, 395–406. Article

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