Template:Beck et al., 2016
- Beck, K.G., Soler-Gijón, R., Carlucci, J.R. & Willis, R.E. 2016. Morphology and histology of dorsal spines of the xenacanthid shark Orthacanthus platypternus from the Lower Permian of Texas, USA: palaeobiological and palaeoenvironmental implications. Acta Palaeontologica Polonica, 61(1): 97–117. DOI: 10.4202/app.00126.2014