M. B. Gaspar, L. M. Chícharo, P. Vasconcelos, A. García, A. R. Santos, and C. C. Monteiro, “Depth segregation phenomenon in Donax trunculus (Bivalvia: Donacidae) populations of the Algarve coast (southern Portugal)”, Sci. mar., vol. 66, no. 2, pp. 111–121, Jun. 2002.