TY - RPRT TI - A visual nonlinearity fed by single cones. AU - D I MacLeod AU - D R Williams AU - W Makous PY - 1992 DO - 10.1016/0042-6989(92)90144-8 UR - https://pubmed.ncbi.nlm.nih.gov/1574850/ ID - 1574850 ER -