Literature references

2 literature references:

Author: Dörfelt, A.R. Schmidt
Year: 2010
Title:
Source: In: in Dörfelt, Schmidt, Struwe & Perrichot, Palaeontographica, Abt. B 283(4-6): 161 + pl. 1, fig. 3
Author: C.Schweinf.
Year: 1946
Title:
Source: In: Bot. Mus. Leafl. 12: 202