@article{bwmeta1.element.bwnjournal-article-fmv129i1p15bwm,
author = {Gert Denk and Wolfgang Metzler},
title = {Nielsen reduction in free groups with operators},
journal = {Fundamenta Mathematicae},
volume = {131},
year = {1988},
pages = {181-197},
zbl = {0665.20013},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv129i1p15bwm}
}
Denk, Gert; Metzler, Wolfgang. Nielsen reduction in free groups with operators. Fundamenta Mathematicae, Tome 131 (1988) pp. 181-197. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv129i1p15bwm/