1. Theory of Codes;Berstel,1985
2. A remark on Morphic Sturmian words;Berstel;R.A.I.R.O., I.T.,1994
3. Descriptions of the characteristic sequence of an irrational;Brown;Canad. Math. Bull.,1993
4. Observatio Arithmetica;Christoffel;Ann. Mat. Pura Appl.,1875
5. A combinatorial property of the Fibonacci word;de Luca;Inform. Process. Lett.,1981