References
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Kraft, P., Pšenička, J., Sakala, J. & Frýda, J. (2018): Initial plant diversification and dispersal event in upper Silurian of the Prague Basin. – Palaeogeography, Palaeoclimatology, Palaeoecology 514(online): 144–155.
Viehofen, A., Hartkopf-Fröder, C. & Friis, E. M. (2008): Inflorescences and flowers of Mauldinia angustiloba sp. nov. (Lauraceae) from middle Cretaceous karst infillings in the Rhenish Massif, Germany. – International Journal of Plant Sciences 169(7): 871–889.
Crepet, W. L. (1978): Investigations of angiosperms from the Eocene of North America: an aroid inflorescence. – Review of Palaeobotany and Palynology 25: 241–252.
Crepet, W. L. & Dilcher, D. L. (1977): Investigations of angiosperms from the Eocene of North America: a mimosoid inflorescence. – American Journal of Botany 64(6): 714–725.
Obrhel, J. (1965): Ilfeldia und Pterophyllum aus dem Oberstephan Böhmens. – Věstník Ústředního ústavu geologického 40(3): 211–213.