@article{ehrenstein_2003,  title={Basics of seeing motion},  volume={66},  ISSN={0004-2749},  url={https://doi.org/10.1590/S0004-27492003000600006},  DOI={10.1590/S0004-27492003000600006},  number={5},  journal={Arquivos Brasileiros de Oftalmologia},  publisher={Conselho Brasileiro de Oftalmologia},  author={Ehrenstein, Walter H.},  year={2003},  pages={44–52} }