Ruby, N. ., Brennan, T. ., Xie, X. ., , Franken, P. ., Heller, H. ., & O’Hara, B. . (2002). Role of melanopsin in circadian responses to light. Science (New York, N.Y.), 298(5601), 2211-3. https://doi.org/10.1126/science.1076701 (Original work published 2002)