Камбрий етаж 4 (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Камбрий етаж 4" in Bulgarian language version.

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Peng, S.C. и др. Continuing progress on chronostratigraphic subdivision of the Cambrian System // Bulletin of Geosciences. 21 септември 2011. DOI:10.3140/bull.geosci.1273. с. 391–396. Посетен на 21 ноември 2012.
Gozalo, Rodolfo и др. Proposal of a reference section and point for the Cambrian Series 2-3 boundary in the Mediterranean subprovince in Murero (NE Spain) and its intercontinental correlation // Geological Journal. 1 декември 2011. DOI:10.1002/gj.1330. с. n/a–n/a.

Peng, S.C. и др. Continuing progress on chronostratigraphic subdivision of the Cambrian System // Bulletin of Geosciences. 21 септември 2011. DOI:10.3140/bull.geosci.1273. с. 391–396. Посетен на 21 ноември 2012.