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journalAt: Kew Bulletin, 21, 2 By: Jeffrey C.
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journalAt: Feddes Repertorium, 113, 7-8 By: Uhl D., Walther H., Krings M.
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bookAt: Paleobiol. Pl. Protists, San Francisco, W. H. Freeman and Company By: Tappan H. N.
journalAt: Transactions of the Illinois State Academy of Science, 1935, 28, 2 By: Schopf J. M.
journalAt: Stratigraphy and Geological Correlation, 4, 6 By: Fotjanova L. I., Serova M. Ya., Levin F. D., Maslova N. P.