Nowak, Hendrik; Harvey, Thomas H.P.; Liu, Huaibao P.; McKay, Robert M.; Zippi, Pierre A.; Campbell, Donald H.; Servais, Thomas. Filamentous eukaryotic algae with a possible cladophoralean affinity from the Middle Ordovician Winneshiek Lagerstätte in Iowa, USA. Geobios. 2017, 50 (4): 303. doi:10.1016/j.geobios.2017.06.005. hdl:2381/40483.
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Nowak, Hendrik; Harvey, Thomas H.P.; Liu, Huaibao P.; McKay, Robert M.; Zippi, Pierre A.; Campbell, Donald H.; Servais, Thomas. Filamentous eukaryotic algae with a possible cladophoralean affinity from the Middle Ordovician Winneshiek Lagerstätte in Iowa, USA. Geobios. 2017, 50 (4): 303. doi:10.1016/j.geobios.2017.06.005. hdl:2381/40483.