@article{1256054115,
author = {Orlik, Peter},
title = {On the extensions of the infinite cyclic group by a $2$-manifold group},
journal = {Illinois J. Math.},
volume = {12},
number = {4},
year = {1968},
pages = { 479-482},
language = {en},
url = {http://dml.mathdoc.fr/item/1256054115}
}
Orlik, Peter. On the extensions of the infinite cyclic group by a $2$-manifold group. Illinois J. Math., Tome 12 (1968) no. 4, pp. 479-482. http://gdmltest.u-ga.fr/item/1256054115/