Kraker, De Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society;
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC155889/ (Publisher version)
Kraker, D., Franssen, M. C. R., Joerink, M., De Groot, A., & Bouwmeester, H. J. (2002). Biosynthesis of costunolide, dihydrocostunolide, and leucodin. Demonstration of cytochrome P450-catalyzed formation of the lactone ring present in sesquiterpene lactones of chicory. Plant Physiology, 129(1), 257-268. doi:10.1104/pp.010957.