P. Addis, M. Secci, A. Angioni, and A. Cau, “Spatial distribution patterns and population structure of the sea urchin Paracentrotus lividus (Echinodermata: Echinoidea), in the coastal fishery of western Sardinia: a geostatistical analysis”, Sci. mar., vol. 76, no. 4, pp. 733–740, Dec. 2012.