Grau, A., M. Linde, and A. M. Grau. “Reproductive Biology of the Vulnerable Species Sciaena Umbra Linnaeus, 1758 (Pisces: Sciaenidae)”. Scientia Marina, vol. 73, no. 1, Mar. 2009, pp. 67-81, doi:10.3989/scimar.2009.73n1067.