2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74956We prove existence of quasi-periodic solutions with two frequencies of completely resonant, periodically forced nonlinear wave equations with periodic spatial boundary conditions. We consider both the cases the forcing frequency is: (Case A) a rational number and (Case B) an irrational number.25 pages, 1 figureFunctional AnalysisAnalysis of PDEs35L05 (primary), 37K50, 58E05 (secondary)text