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  1. Cardaria, Coronopus, and Stroganowia are united with Lepidium (Brassicaceae)
    By: Al-Shehbaz, I A - Appel, O - Mummenhoff, K
    Type: Article
    In: Novon
    Volume: 12
    Date: 2002
    Page Range: 5--11
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  2. The Relations Between Scientific Botany and Phytopathology
    By: Appel, O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 2
    Date: 1915
    Page Range: 275--285
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  3. The status of Teesdaliopsis and Teesdalia (Brassicaceae)
    By: Appel, O
    Type: Article
    In: Novon
    Volume: 8
    Date: 1998
    Page Range: 218--219
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