no. 3
Hausdorff combing of groups and π 1 ∞ for universal covering spaces of closed 3-manifolds
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 387-414. 
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     author = {Po\'enaru, V. and Tanasi, C.},
     title = {Hausdorff combing of groups and $\pi ^\infty _1$ for universal covering spaces of closed 3-manifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {387--414},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {3},
     year = {1993},
     zbl = {0821.57014},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1993_4_20_3_387_0/}
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Poénaru, V.; Tanasi, C. Hausdorff combing of groups and $\pi ^\infty _1$ for universal covering spaces of closed 3-manifolds. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 387-414. http://www.numdam.org/item/ASNSP_1993_4_20_3_387_0/

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