@article{Valois90-JOSA,

author={K. K. de Valois and M. A. Webster and E. Switkes},
title={Orientation and spatial-frequency discrimination for luminance and chromatic gratings},
journal={Journal of the Optical Society of America},
volume={7},
year={1990},
pages={1034-1049},
number={6},
theme = {vision,perception,ecarts,frequentiel}
 }