Ballantyne, J.S. & Chamberlin, M.E. & Singer, T.D. (1992)
Oxidative Metabolism in Thermogenic Tissues of the Swordfish and Mako Shark. Journal of Experimental Zoology, 261, 110–114

Singer, T.D. & Ballantyne, J.S. (1989)
Absence of Extrahepatic Lipid Oxidation in a Freshwater Elasmobranch, the Dwarf Stingray Potamotrygon magdalenae: Evidence From Enzyme Activities. Journal of Experimental Zoology, 251, 355–360
DOI: 10.1002/jez.1402510312