Martín-Vaquero J., Hernández Encinas A., Queiruga-Dios A., Martínez V. and del Rey Ángel M. (2018) “Numerical schemes for general Klein–Gordon equations with Dirichlet and nonlocal boundary conditions”, Nonlinear Analysis: Modelling and Control, 23(1), pp. 50-62. doi: 10.15388/NA.2018.1.5.