桑比期 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "桑比期" in Chinese language version.

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doi.org

Wellman, C.H.; Gray, J. The microfossil record of early land plants. Phil. Trans. R. Soc. B. 2000, 355 (1398): 717–732. PMC 1692785 . PMID 10905606. doi:10.1098/rstb.2000.0612.

google.de

books.google.de

Gradstein, F. M. (编). The Geologic Time Scale 2012. Elsevier Science Ltd. 2012: 504. ISBN 978-0444594259.

nih.gov

ncbi.nlm.nih.gov

Wellman, C.H.; Gray, J. The microfossil record of early land plants. Phil. Trans. R. Soc. B. 2000, 355 (1398): 717–732. PMC 1692785 . PMID 10905606. doi:10.1098/rstb.2000.0612.