Published in: Akademie der Wissenschaften und der Literatur Mainz: Abhandlungen der Mathematisch-Naturwissenschaftlichen Klasse ; 1959,5

Published in: Bulletin mensuel - Société botanique de Lyon ; Vol. 1, n° 8, p. 104

Published in: Müller, L.: Zur biologischen Anatomie der Blütte von Ceropegia Woodii Schlechter., -: - 1926.

Published in: British Cactus & Succulent Journal

Published in: The National Cactus and Succulent Journal

Published in: CactusWorld

Published in: Curtis's Botanical Magazine

Published in: Austrobaileya: A Journal of Plant Systematics

Published in: Austrobaileya

Published in: The Cactus and Succulent Journal of Great Britain

Published in: British Cactus & Succulent Journal

Published in: In Vitro Cellular & Developmental Biology. Plant

Published in: In Vitro Cellular & Developmental Biology - Plant

Published in: The National Cactus and Succulent Journal

Published in: Bothalia

Published in: The National Cactus and Succulent Journal

Published in: Feddes Repertorium

Published in: Annals of Plant Sciences