Demirhan, S.A. & Seyhan, K. (2007)
Life history of spiny dogfish, Squalus acanthias (L. 1758), in the southern Black Sea. Fisheries Research, 85(1–2), 210–216
DOI: 10.1016/j.fishres.2007.02.009

Demirhan, S.A. & Engin, S. & Seyhan, K. & Akamca, E. (2005)
Some biological aspects of thornback ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences, 5(2), 75–83