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Smith, S.; Collinson, M.; Rudall, P. (2008). "Fossil Cyclanthus (Cyclanthaceae, Pandanales) from the Eocene of Germany and England". American Journal of Botany. 95 (6): 688–699. doi:10.3732/ajb.2007390. PMID21632394.
Gee, C.; Taylor, D. (2019). "An Extinct Transitional Leaf Genus of Nymphaeaceae from the Eocene Lake at Messel, Germany: Nuphaea engelhardtii Gee et David W. Taylor gen. et sp. nov". International Journal of Plant Sciences. 180 (7): 724–736. doi:10.1086/704376. S2CID201211546.
Wilde, V.; Kvaček, Z.; Bogner, J. (2005). "Fossil leaves of the Araceae from the European Eocene and notes on other aroid fossils". International Journal of Plant Sciences. 166 (1): 157–183. doi:10.1086/425673. S2CID85215526.
Doweld, A. B. (2021). "Fossil Alloceltidoxylon, Allonymphaea, Arecocaryon, Paralnoxylon and Paranyssa and extant Komaroviopsis, Marcanodendron, and Papyrocactus (Magnoliophyta), new replacement generic names". Phytotaxa. 524 (2): 92–98. doi:10.11646/phytotaxa.524.2.3. S2CID243482734.
Winkler, I.; Labandeira, C.; Wappler, T.; Wilf, P. (2010). "Distinguishing Agromyzidae (Diptera) leaf mines in the fossil record: new taxa from the Paleogene of North America and Germany and their evolutionary implications". Journal of Paleontology. 84 (5): 935–954. doi:10.1666/09-163.1. S2CID56378236.
Pflug, H.D. (1952). "Palynologie und Stratigraphie der eozänen Braunkohlen von Helmstedt (Palynology and stratigraphy of the Eocene Brown-Coal of Helmstedt)". Paläontologische Zeitschrift (in German). 26 ((1/2)): 112–137. doi:10.1007/BF03041729. S2CID140715968.