Gerrienne, P., Meyer-Berthaud, B., Fairon-Demaret, M., Streel, M., & Steemans, P. (2005). The Middle-Devonian proto-ovule Runcaria heinzelinii Stockmans 1968 [Paper presentation]. XVII International Botanical Congress, Vienna, Austria. https://hdl.handle.net/2268/137793
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Streel, M., Higgs, K., Loboziak, S., Riegel, W., & Steemans, P. (1987). Spore stratigraphy and correlation with faunas and floras in the type marine Devonian of the Ardenne-Rhenish regions. Review of Palaeobotany and Palynology, 50 (3), 211-229. doi:10.1016/0034-6667(87)90001-7 https://hdl.handle.net/2268/21568