Девон кезеңі (Kazakh Wikipedia)

Analysis of information sources in references of the Wikipedia article "Девон кезеңі" in Kazakh language version.

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doi.org

Kaufmann, B.; Trapp, E.; Mezger, K. (2004). "The numerical age of the Upper Frasnian(Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany)". The Journal of geology 112 (4): 495-501. doi:10.1086/421077.