Martín-Vaquero, Jesús, Ascensión Hernández Encinas, Araceli Queiruga-Dios, Víctor Martínez, and Ángel Martín Martín del Rey. 2018. “Numerical Schemes for General Klein–Gordon Equations With Dirichlet and Nonlocal Boundary Conditions”. Nonlinear Analysis: Modelling and Control 23 (1): 50-62. https://doi.org/10.15388/NA.2018.1.5.