Alexander, M.D. & Haslewood, E.S. & Haslewood, G.A.D. & Watts, D.C. & Watts, R.L. (1968)
Osmotic control and urea biosynthesis in selachians. Comparative Biochemistry and Physiology, 26(3), 971–978
DOI: 10.1016/0010-406X(68)90017-0

Watts, D.C. & Watts, R.L. (1966)
Carbamoyl phosphate synthetase in the elasmobranchii: Osmoregulatory function and evolutionary implications. Comparative Biochemistry and Physiology, 17(3), 785–798
DOI: 10.1016/0010-406X(66)90121-6