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@article{ADM_2004_2_a6, author = {Selami Ercan}, title = {Torsion-free groups with every proper homomorphic image an $\bf N_{1}$-group}, journal = {Algebra and discrete mathematics}, pages = {56--58}, publisher = {mathdoc}, number = {2}, year = {2004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ADM_2004_2_a6/} }
Selami Ercan. Torsion-free groups with every proper homomorphic image an $\bf N_{1}$-group. Algebra and discrete mathematics, no. 2 (2004), pp. 56-58. http://geodesic.mathdoc.fr/item/ADM_2004_2_a6/