ANDREEV, P.S. & COATES, M.I. & SHELTON, R.M. & COOPER, P.R. & SMITH, M.P. & SANSOM, I.J. (2015)
Upper Ordovician chondrichthyan-like scales from North America. Palaeontology, 58 (4): 691–704
DOI: 10.1111/pala.12167