Template:Kerp, et al., 1991

• Kerp, J.F.H., Naugolnykh, S. V. & Haubold, H. 1991. Graciliopteris, a new name for Sphenocallipteris Haubold et Kerp. Rev. Palaeobot. Palynol. 69: 69-370.  
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