Plotopteridae (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Plotopteridae" in German language version.

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doi.org

Gerald Mayr, James L. Goedert, Vanesa L. De Pietri, R. Paul Scofield: Comparative osteology of the penguin-like mid-Cenozoic Plotopteridae and the earliest true fossil penguins, with comments on the origins of wing-propelled diving. Journal of Zoological Systematics and Evolutionary Research, Juni, 2020; doi: 10.1111/jzs.12400
Storrs L. Olson, Yoshikazu Hasegawa (1979): Fossil Counterparts of Giant Penguins from the North Pacific. Science 9. November 1979: Vol. 206. Nr. 4419, Seiten 688–689 doi:10.1126/science.206.4419.688

Howard, H. (1969): A new avian fossil from Kern County, California. Condor 71: 68–69. PDF