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Rio, J. P., Repérant, J., Ward, R., Peyrichoux, J., & Vesselkin, N. (1989). A preliminary description of the regeneration of optic nerve fibers in a reptile, Vipera aspis. Brain Research, 479(1), 151–156. doi:10.1016/0006-8993(89)91345-0 
10.1016/0006-8993(89)91345-0