@article{GDZPPN002299267, title = {The Centre of Groups with One Defining Relator.}, journal = {Mathematische Annalen}, volume = {179}, year = {1968}, pages = {315-319}, zbl = {0157.34901}, url = {http://dml.mathdoc.fr/item/GDZPPN002299267} }
BAUMSLAG, G.; TAYLOR, T. The Centre of Groups with One Defining Relator.. Mathematische Annalen, Tome 179 (1968) pp. 315-319. http://gdmltest.u-ga.fr/item/GDZPPN002299267/