Tuya, F., and P. Duarte. “Role of Food Availability in the Bathymetric Distribution of the Starfish Marthasterias Glacialis (Lamk.) on Reefs of Northern Portugal”. Scientia Marina, vol. 76, no. 1, Mar. 2012, pp. 9-15, doi:10.3989/scimar.2012.76n1009.