Ferguson, G. P., Ter Maat, A., Parsons, D. W., & Pinsker, H. M. (1989). Egg laying
in Aplysia. I. Behavioral patterns and muscle activity of freely behaving animals after selectively elicited bag cell discharges. Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology,
164(6), 835-847. doi:10.1007/bf00616755.