Quynh, Ha Quy, et al. “WEBGIS Technology for Management and Sharing Spatial Data of Protected Area, a Case Study in Xuan Lien Nature Reserve, Thanh Hoa”. Vietnam Journal of Science and Technology, vol. 54, no. 4, Aug. 2016, pp. 460-71, doi:10.15625/0866-708X/54/4/7356.