Nguyen, Lau. “HOW ACCURACY GPS PRECISE POINT POSITIONING CAN BE ACHIEVED?”. VNUHCM Journal of Science and Technology Development 12, no. 18 (December 15, 2009): 25-31. Accessed August 30, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/2379.