Debski, E. ., Liu, Q. ., & Chapman, A. . (1995). Non-uniform distribution of cellular phenotypes in the optic tectum of the leopard frog. The Journal of Comparative Neurology, 360(4), 671-84. https://doi.org/10.1002/cne.903600411 (Original work published 1995)

Chapman, A. ., & Debski, E. . (1969). Neuropeptide Y immunoreactivity of a projection from the lateral thalamic nucleus to the optic tectum of the leopard frog. Visual Neuroscience, 12(1), 1-9. https://doi.org/10.1017/s0952523800007264 (Original work published 1969)