@article{ITA_2001__35_6_579_0,
     author = {Do Lago, Alair Pereira and Simon, Imre},
     title = {Free burnside semigroups},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {579--595},
     year = {2001},
     publisher = {EDP Sciences},
     volume = {35},
     number = {6},
     mrnumber = {1922297},
     zbl = {1061.20049},
     language = {en},
     url = {https://www.numdam.org/item/ITA_2001__35_6_579_0/}
}