“Allelopathic effects of aqueous extracts of leaves of tree marigold (Tithonia diversifolia (Hemsl.) A. Gray) on seed germination and seedling growth of lettuce (Lactuca sativa L.)” (2013) Scientia Agropecuaria, 4(3), pp. 229–241. doi:10.17268/sci.agropecu.2013.03.09.