Aslanov, Afgan2024-03-132024-03-1320090932-0784https://doi.org/10.1515/zna-2009-1-220https://hdl.handle.net/20.500.12662/3759The approximate and/or exact solutions of the generalized Klein-Gordon- and sine-Gordon-type equations are obtained. We introduce a new type of initial conditions to extend the class of solvable problems.eninfo:eu-repo/semantics/openAccessSingularityInitial Value ProblemsHomotopy-Perturbation MethodKlein-Gordon EquationArticle10.1515/zna-2009-1-2202-s2.0-614491701061521-2Q314964WOS:000265402600020Q3