Pham Ngoc Thang, Nguyen Duc Thien, Nguyen Thi Quyen, and Cao Thi Xuan Thu. “PROCESSING OF THE OBSERVATION RESULTS FOR NON-ELECTRICAL MEASUREMENT DEVICES BY RUNGE-KUTTA METHOD”. UTEHY Journal of Applied Science and Technology, Vol. 32, Dec. 2021, pp. 20-25, http://tapchi.utehy.edu.vn/index.php/jst/article/view/494.