Bailey, M., Chong, N., Xiong, J., & Cassone, V. (2002). Chickens’ Cry2: molecular analysis of an avian cryptochrome in retinal and pineal photoreceptors. FEBS Letters, 513(2-3), 169-74. https://doi.org/10.1016/s0014-5793(02)02276-7 (Original work published 2002)

Chong, N., Cassone, V., Bernard, M., Klein, D., & Iuvone, P. (1998). Circadian expression of tryptophan hydroxylase mRNA in the chicken retina. Brain Research. Molecular Brain Research, 61(1-2), 243-50. https://doi.org/10.1016/s0169-328x(98)00219-8 (Original work published 1998)