Helicoplacus (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helicoplacus" in English language version.

refsWebsite

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1web.archive.org

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1semanticscholar.org

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doi.org

Smith, A. B.; Zamora, S.; Álvaro, J. J. (2013). "Figure 3: Stratigraphic distribution of early to middle Cambrian echinoderms". Nature Communications. 4: 1385. doi:10.1038/ncomms2391. PMID 23340425.
Peng, S.C.; Babcock, L.E.; Ahlberg, P. (2020). "Chapter 19 – The Cambrian Period". Geologic Time Scale 2020. Elsevier. pp. 565–629. doi:10.1016/B978-0-12-824360-2.00019-X. S2CID 242177216.

nih.gov

pubmed.ncbi.nlm.nih.gov

Smith, A. B.; Zamora, S.; Álvaro, J. J. (2013). "Figure 3: Stratigraphic distribution of early to middle Cambrian echinoderms". Nature Communications. 4: 1385. doi:10.1038/ncomms2391. PMID 23340425.

semanticscholar.org

api.semanticscholar.org

Peng, S.C.; Babcock, L.E.; Ahlberg, P. (2020). "Chapter 19 – The Cambrian Period". Geologic Time Scale 2020. Elsevier. pp. 565–629. doi:10.1016/B978-0-12-824360-2.00019-X. S2CID 242177216.

usna.edu

"Associate Professor Peter L. Guth Home Page". Archived from the original on 1999-02-03.

web.archive.org

"Associate Professor Peter L. Guth Home Page". Archived from the original on 1999-02-03.