Phuong, V. X., D. Q. Vu, and D. T. Xuyen. “Genus Didymocarpus Wall. And a New Record of Species Didymocarpus Purpureobracteatus Smith for the Flora of Vietnam from Xuan Lien Natural Reserve, Thanh Hoa Province”. Academia Journal of Biology, vol. 36, no. 1, Aug. 2014, pp. 46-50, doi:10.15625/0866-7160/v36n1.4516.