Gomes, G., Mello, C., da Rosa, M., Bochi, G., Ferreira, J., Barron, S., & Rubin, M. (2010). Polyaminergic agents modulate contextual fear extinction in rats. Neurobiology of Learning and Memory, 93(4), 589-95. https://doi.org/10.1016/j.nlm.2010.02.007 (Original work published 2010)