Roubos, E. W., Vandeven, A. M. H., & Ter Maat, A. (1990). Quantitative ultrastructural
tannic-acid study of the relationship between electrical-activity and peptide secretion by the bag cell neurons of aplysia-californica. Neuroscience Letters, 111(1-2), 1-6. doi:10.1016/0304-3940(90)90334-6.