Gitlin, D. & Perricelli, A. & Gitlin, J.D. (1973)
Immunoglobulin synthesis in fetal sharks. Comparative Biochemistry and Physiology – Part A, Physiology, 45(2), 247–256
DOI: 10.1016/0300-9629(73)90432-5

Gitlin, D. & Perricelli, A. & Gitlin, J.D. (1973)
The presence of serum α-fetoprotein in sharks and its synthesis by fetal gastrointestinanl tract and liver. Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 46(2), 207–215
DOI: 10.1016/0305-0491(73)90311-8

Gitlin, D. & Perricelli, A. & Gitlin, J.D. (1973)
Multiple immunoglobulin classes among sharks and their evolution. Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 44(1), 225–228
DOI: 10.1016/0305-0491(73)90360-X