Moller, I.J. & Melsen, B. & Jensen, S.J. & Kirkegaard, E. (1975)
A histological, chemical and x-ray diffraction study on contemporary (Carcharias glaucus) and fossilized (Macrota odontaspis) shark teeth.
Archives of Oral Biology, 20(12), 797–802 DOI: 10.1016/0003-9969(75)90056-4