@article{ITA_1990__24_3_205_0,
     author = {de Luca, Aldo and Varricchio, Stefano},
     title = {A combinatorial theorem on $p$-power-free words and an application to semigroups},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {205--228},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {3},
     year = {1990},
     mrnumber = {1072991},
     zbl = {0701.68065},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1990__24_3_205_0/}
}