R. L. Badhwar, R. M. Beri, G. V. Karira, and S. Ramaswami, “<I>Rauwolfia Serpentina</I>: Studies on Optimum Methods of Propagation and their Effect on Production and Alkaloidal Content of Roots”, Indian Forester, vol. 89, no. 11, pp. 729–736, Nov. 1963.