Vallarino, M. & Bucharles, C. & Facchinetti, F. & Vaudry, H. (1994)
Immunocytochemical evidence for the presence of Met-enkephalin and Leu-enkephalin in distinct neurons in the brain of the elasmobranch fish Scyliorhinus canicula. Journal of Comparative Neurology, 347(4), 585–597
DOI: 10.1002/cne.903470409