CHUNG, I.-M.; DANG KHANH, T.; LEE, O.-K.; AHMAD, A. Chemical Constitutents from Ajwain Seeds (Trachyspermum Ammi) and Inhibitory Activity of Thymol, Lupeol and Fatty Acids on Barnyardgrass and Radish Seeds. ajc 2010, 19, 1524-1534.