Mumm, D.P. & Atha, D.H. & Riggs, A. (1978)
The hemoglobin of the common sting-ray, Dasyatis sabina: Structural and functional properties. Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 60(2), 189–193
DOI: 10.1016/0305-0491(78)90129-3

Pennelly, R.R. & Noble, R.W. & Riggs, A. (1975)
Equilibria and ligand binding kinetics of hemoglobins from the sharks, Prionace glauca and Carcharhinus milberti. Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 52(1), 83–87
DOI: 10.1016/0305-0491(75)90119-4