Bollweiler Birne (German Wikipedia)

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

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archive.org

F. L. Krebs: Vollständige Beschreibung und Abbildung der sämmtlichen Holzarten. Erster Theil, Vieweg, 1826, S. 270 ff, Tafel LXXI, archive.org.

doi.org

Karl Sax: Chromosome behavior in Sorbopyrus and Sorbaronia. In: Proc. Natl. Acad. Sci. U S A. 15(11), 1929, S. 844–845, doi:10.1073/pnas.15.11.844.