A. K. Sharma, K. S. Negi, H. Y. Shukla, and S. K. Pareek, “Effect of Different NPK Doses on the Plant Growth and Rhizome Yield in <I>Curcuma zedoria</I> (Christm.) Rosc. (Karchoor) : a less Known Medicinal Plant Introduced in Uttaranchal”, Indian Forester, vol. 132, no. 4, pp. 509–513, Apr. 2006.