1. Mots de Fibonacci;Berstel,1980
2. J. Berstel, Trace de droites, fraction continues et morphismes itérés, Tech. Rept. 1987-61, LITP, Université de Paris VI et VII.
3. Uniform tag sequences;Cobham;Math. Systems Theory,1972
4. Rewriting products of groups elements;Blyth,1987
5. Sequences with minimal block growth;Coven;Math. Systems Theory,1973