@article{GDZPPN001258362, title = {Infinite products in monoids.}, journal = {Semigroup forum}, volume = {33}, year = {1986}, pages = {21-68}, zbl = {0601.20061}, url = {http://dml.mathdoc.fr/item/GDZPPN001258362} }
Dehornoy, P. Infinite products in monoids.. Semigroup forum, Tome 33 (1986) pp. 21-68. http://gdmltest.u-ga.fr/item/GDZPPN001258362/