Выкладывайте пдфки о ранних гибодонтах, пожалуйста! New hybondontoid shark from the Permocarboniferous (Gzhelian–Asselian) of Guardia Pisano (Sardinia, Italy)
http://www.app.pan.pl/archive/published/app55/app20090019.pdf
Studies on the Paleozoic Selachian Genus Ctenacanthus Agassiz. No. 3. Nominal Species Referred to Ctenacanthus
http://digitallibrary.amnh.org/dspace/bitstream/2246/3535/1/N2774.pdf
