Birkenia (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Birkenia" in Polish language version.

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H. Blom, T. Märss, C. G. Miller. Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere. „Earth and Environmental Science Transactions of the Royal Society of Edinburgh”. 92, s. 263–323, 2001. DOI: 10.1017/S0263593300000250. (ang.).

web.archive.org

Tiiu Märss. Silurian and Lower Devonian anaspids (Agnatha) from Severnaya Zemlya (Russia). „Geodiversitas”. 24 (1), s. 123–137, 2002. (ang.).