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♦ ¹Feeding Habits of Black Scorpionfish Scorpaena porcus, in the South-Eastern Black Sea, Nimet Selda Başçınar, Hacer Sağlam, Turkish Journal of Fisheries and Aquatic Sciences 9: 99-103 (2009)
♦ ²Diet comparison of four ray species (Raja clavata, Raja brachyura, Raja montagui and Leucoraja naevus) caught along the Portuguese continental shelf, Inês Farias, Ivone Figueiredo, Teresa Moura, Leonel Serrano Gordo, Ana Neves and Bárbara Serra-Pereira, Aquat. Living Resour. 19, 105–114 (2006)