600 (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "600" in Catalan language version.

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nih.gov

pubmed.ncbi.nlm.nih.gov

diversos autors «Diverse variola virus (smallpox) strains were widespread in northern Europe in the Viking Age». Science, 6502, 369, 24-07-2020.

worldcat.org

Murray, H. J. R.. A history of chess (en anglès). Northampton, Mass.: Benjamin Press, [1986?], p. 163. ISBN 0-936317-01-9.