1. Parallel evolution in leaf venation: an alternative view of angiosperm origins;Alvin;Nature,1970
2. Glossopteris anatolica sp. nov. from uppermost Permian strata in south-east Turkey;Archangelsky;Bull. Brit. Museum Natur. Hist. (Geol.),1983
3. Gigantopteris flora in China and Southeast Asia;Asama,1984
4. Reconstruction of eastern Gondwanaland
5. Boureau E. (1964) Traité de paléobotanique Vol. 3: Sphenophyta, Noeggerathiopsida (Masson et Cie, Paris).