Gallus, L., P. Ramoino, M. Faimali, V. Piazza, G. Maura, and M. Marcoli. “Presence and Distribution of Serotonin Immunoreactivity in the Cyprids of the Barnacle Balanus Amphitrite”. European Journal of Histochemistry, vol. 49, no. 4, June 2009, pp. 341-8, doi:10.4081/961.