Taherkhani, Mahboubeh, et al. “Volatile Constituents of the Aerial Parts of Ferulago Subvelutina Rech. f., Ferulago Stellata Boiss., Leaves and Flowers of Prangos Ferulacea (L.) Lindle. And Leaves of Ferula Ovina (Boiss.) Boiss.: Four Umbelliferae Herbs from Iran”. Asian Journal of Chemistry, vol. 24, no. 4, Dec. 2011, pp. 1601-6, https://asianpubs.org/index.php/ajchem/article/view/8866.