Ngoan, Bui Thi, et al. “A Polyhydroxylated Sterol and a Saponin Isolated from the Starfish Culcita Novaeguineae”. <i>Vietnam Journal of Chemistry</i>, vol. 53, no. 2e, May 2015, pp. 23-27, doi:10.15625/0866-7144.2015-2e-006.