@article{SF_1986__34_134828,
     author = {P. Dehornoy},
     title = {Infinite products in monoids.},
     journal = {Semigroup forum},
     pages = {21--68},
     publisher = {mathdoc},
     volume = {34},
     year = {1986},
     zbl = {0601.20061},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__34_134828/}
}