Guyon, A., Roques, B., Guyon, F., Foucault, A., Perdrisot, R., Swerts, J., & Schwartz, J. (1979). Enkephalin degradation in mouse brain studied by a new H.P.L.C. method: further evidence for the involvement of carboxydipeptidase. Life Sciences, 25(18), 1605-11. https://doi.org/10.1016/0024-3205(79)90444-2 (Original work published 1979)