Bound states of the Klein-Gordon equation and Dirac equation with the Manning-Rosen scalar and vector potentials;

Bound states solutions of the Klein-Gordon equation with Hartmann potential;

Bound states of Klein-Gordon equation for generalized Hartmann potentials;

Various traveling wave solutions with double parameters,which are expressed by the hyperbolic functions and trigeonometic functions,for a class of nonlinear Klein-Gordon equations are found out by using the projective Riccati equptions and homogenous balance principle.

In this paper,by using the recently proposed F-expansion method and the software of Mathematica,the periodic wave solutions expressed by Jacobi elliptic functions to the Klein-Gordon-Zakharov in three dimensional space are derived,and in the limit case,the solitary wave solutions and other type solutions for Klein-Gordon-Zakharov equations are obtained.

In this paper,by using a new class of Riccati equations and the extended tanh-fuction method,exact solutions of the Klein-Gordon-Zakharov equations in three space dimensions are constructed.

The blow up result of the following nonlinear Klein Gordon systems with positive initial energyu tt +u t -Δu+u-|v| ρ+2 |u| ρu=0 v tt +v t -Δv+v-|u| ρ+2 |v| ρv=0is studied.