@article{chen2013contrast,
  title={Contrast-Dependent Variations in the Excitatory Classical Receptive Field and Suppressive Nonclassical Receptive Field of Cat Primary Visual Cortex},
  author={Chen, Ke and Song, Xue-Mei and Li, Chao-Yi},
  journal={Cerebral Cortex},
  volume={23},
  number={2},
  pages={283--292},
  year={2013},
  publisher={Oxford Univ Press}
}