1. The Burnside Problem and Identities in Groups;Adian,1979
2. Magic cubes and Prouhet sequences;Adler;Amer. Math. Monthly,1977
3. Démonstration de l'existence des suites asymétriques finies;Arshon;Mat. Sb.,1937
4. A. de Luca and S. Varricchio, Some combinatorial properties of the Thue-Morse sequence and a problem in semigroups (to appear).
5. Generators and relations in groups-The Burnside problem;Hall,1964