Template:Heyler & Poplin, 1989
- Heyler, D. & Poplin, C. 1989. Systematics and relationships among the Xenacanthiformes (Pisces, Chondrichthyes) in the light of Carboniferous and Permian French materal. Acta Musei Reginaehradecensis S. A. Scientiae Naturales 22: 69–78.