@article{cardoso_de o. cruz_silva_cortez_2009,  title={A simple model for circadian timing by mammals},  volume={42},  ISSN={0100-879X},  url={https://doi.org/10.1590/S0100-879X2009000100017},  DOI={10.1590/S0100-879X2009000100017},  number={1},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Cardoso, F.R.G. and de O. Cruz, F.A. and Silva, D. and Cortez, C.M.},  year={2009},  month={Jan},  pages={122–127} }