@article{pinho_lobão_2000,  title={Rigorous results for aperiodic and almost periodic substitution sequences},  volume={30},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332000000400026},  DOI={10.1590/S0103-97332000000400026},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Pinho, S. T. R. and Lobão, T. C. Petit},  year={2000},  month={Dec},  pages={772–777} }