Da, Hoang Van, Tran Dinh Son, and Nguyen Duc Tinh. “Asymptotic Solution of the High Order Partial Differential Equation”. <i>Vietnam Journal of Mechanics</i> 31, no. 2 (June 17, 2009): 65–74. Accessed November 8, 2025. https://vjmech.vast.vn/vjmech/article/view/5480.