We show that the class of groups which have monoid presentations by means of finite special -confluent string-rewriting systems strictly contains the class of plain groups (the groups which are free products of a finitely generated free group and finitely many finite groups), and that any group which has an infinite cyclic central subgroup can be presented by such a string-rewriting system if and only if it is the direct product of an infinite cyclic group and a finite cyclic group.
@article{ITA_2004__38_3_245_0, author = {Parkes, Duncan W. and Shavrukov, V. Yu. and Thomas, Richard M.}, title = {Monoid presentations of groups by finite special string-rewriting systems}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {38}, year = {2004}, pages = {245-256}, doi = {10.1051/ita:2004012}, mrnumber = {2076402}, zbl = {1071.20037}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_2004__38_3_245_0} }
Parkes, Duncan W.; Shavrukov, V. Yu.; Thomas, Richard M. Monoid presentations of groups by finite special string-rewriting systems. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 38 (2004) pp. 245-256. doi : 10.1051/ita:2004012. http://gdmltest.u-ga.fr/item/ITA_2004__38_3_245_0/
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