Luo, Z. and Jin, S. 2017. A Reduced-Order Extrapolation Spectral-Finite Difference Scheme Based on the POD Method for 2D Second-Order Hyperbolic Equations. Mathematical Modelling and Analysis. 22, 5 (Sep. 2017), 569-586. DOI:https://doi.org/10.3846/13926292.2017.1334714.