C. Swaminathan, R . S. Vinaya Rai, K. K. Suresh, and K . Sivaganam. 1993. “IMPROVING SEED GERMINATION OF <em>DERRIS</em> <em>INDICA</Em> BY VERTICAL SOWING”. Journal of Tropical Forest Science (JTFS) 6 (2):152-58. https://jtfs.frim.gov.my/jtfs/article/view/1885.