Verma, S. K., and R. K. Bhatt. “Conjointed Twins in <I>Diploknema butyracea< I> Roxb. - a Case of Polyembryony”. Indian Forester, vol. 132, no. 5, May 2006, pp. 627-8, doi:10.36808/if/2006/v132i5/4212.