Luo, Zhendong, and Shiju Jin. “A Reduced-Order Extrapolation Spectral-Finite Difference Scheme Based on the POD Method for 2D Second-Order Hyperbolic Equations”. Mathematical Modelling and Analysis 22, no. 5 (September 21, 2017): 569-586. Accessed April 29, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/913.