Neuenschwander, Markus, Andreas Neuenschwander, and Ernst Steinegger. “Die Struktur Der Sesquiterpene Von Petasites Hybridus (L.) G. M. Et Sch”. CHIMIA 33, no. 2 (February 28, 1979): 50. Accessed April 4, 2025. https://www.chimia.ch/chimia/article/view/1979_50.