Mohamed, A. E.-H. H. ; Ahmed, A. A. ; Wollenweber, Eckhard ; Bohm, B. ; Asakawa, Y. (2006):
Highly oxygenated guaianolides and eudesman-12-oic acids from Balsamorhiza sagittata and Balsamorhiza macrophylla.
In: Chemical & pharmaceutical bulletin, 54, pp. 152-155. [Article]

Wollenweber, Eckhard ; Dörr, M. ; Dörsam, M. ; Hassan, A. El. ; Ahmed, A. A. ; Hegazy, M. F. ; Zeller, K.-P. (2003):
Flavonoids and terpenoids from the resinous exudates of Madia species (Asteraceae, Helnieae).
In: Zeitschrift für Naturforschung / C, 58, pp. 153-160. [Article]