Krstulovic Sifner, S. & Vrgoc, N. & Dadic, V. & Isajlovic, I. & Peharda, M. & Piccinetti, C. (2009)
Long-term changes in distribution and demographic composition of thornback ray, Raja clavata, in the northern and central Adriatic Sea. Journal of Applied Ichthyology, 25(S1), 40–46
DOI: 10.1111/j.1439-0426.2008.01204.x

Soldo, A. & Peharda, M. & Onofri, V. & Glavic, N. & Tutman, P. (1999)
New record and some morphological data of the basking shark, Cetorhinus maximus (Gunnerus, 1765), in the eastern adriatic. Annales, Series Historia Naturalis, 9(2), 229–232