P.  Mungkornasawakul, Chaiyong, S., Sastraruji, T., Jatisatienr, A., Jatisatienr, C., Pyne, S. G., Ung, A. T., Korth, J., and Lie, W., ?Alkaloids from the Roots of Stemona aphylla?, J. Nat. Prod., vol. 72 (5), pp. 848 - 851, 2009.