@article{SF_1987__36_134891,
     author = {V. Bruy\`ere},
     title = {Maximal prefix products.},
     journal = {Semigroup forum},
     pages = {147--158},
     year = {1987},
     volume = {36},
     zbl = {0617.20041},
     url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134891/}
}