A taxonomic revision of the late Paleozoic lyginopterid and description of its globose-stem growth habitDOI: info:10.1016/j.revpalbo.2021.104591v. 298Elsevier
DiMichele, William A., Kerp, Hans, Lucas, Spencer G., and Chaney, Dan S. 2022. "A taxonomic revision of the late Paleozoic lyginopterid Sphenopteridium germanicum and description of its globose-stem growth habit." Review of palaeobotany and palynology, 298. https://doi.org/10.1016/j.revpalbo.2021.104591.