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Casares, F.M., McElroy, A., Mantione, K.J., Baggermann, G., Zhu, W. and Stefano, G.B. (2005). «The American lobster, Homarus americanus, contains morphine that is coupled to nitric oxide release in its nervous and immune tissues: Evidence for neurotransmitter and hormonal signaling». Neuro Endocrinol. Lett.26 (2): 89-97. PMID15855878.
Fossat, P., Bacqué-Cazenave, J., De Deurwaerdère, P., Delbecque, J.-P. and Cattaert, D. (2014). «Anxiety-like behavior in crayfish is controlled by serotonin». Science344 (6189): 1293-1297. Bibcode:2014Sci...344.1293F. PMID24926022. doi:10.1126/science.1248811.
Sneddon, L.U. (2015). «Pain in aquatic animals». Journal of Experimental Biology218 (7): 967-976. PMID25833131. doi:10.1242/jeb.088823.
Magee, B.; Elwood, R.W. (2013). «Shock avoidance by discrimination learning in the shore crab (Carcinus maenas) is consistent with a key criterion for pain». Journal of Experimental Biology216 (3): 353-358. PMID23325857. doi:10.1242/jeb.072041.