Venkataraman, R., and S. Gopalakrishnan. “Isolation and Characterisation of a New Stereoisomeric Furofuran Type of Lignan from Ecbolium Linneanum Kurz ”. Asian Journal of Chemistry, vol. 14, no. 1, Mar. 2010, pp. 277-82, https://asianpubs.org/index.php/ajchem/article/view/22007.