Periodon (English Wikipedia)

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

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doi.org (Global: 2^nd place; English: 2^nd place)

Svend Stouge (2012). "Middle Ordovician (late Dapingian–Darriwilian) conodonts from the Cow Head Group and Lower Head Formation, western Newfoundland, Canada". Canadian Journal of Earth Sciences. 49 (1): 59–90. doi:10.1139/e11-057.

ordovician.cn (Global: low place; English: low place)

The Base of the Middle Ordovician Series Using Graphic Correlation Method^{[dead link]} Svend Stouge, Wang Xiofeng, Li Zhihong, Chen Xiaohong, and Wang Chuanshang.