%0 Journal Article %T Periodic Solutions for a Class of Damped Vibration Problem %A WANG Shao-min %J Journal of Chongqing Normal University %D 2012 %I Chongqing Normal University %X The purpose of this paper is to study the existence of periodic solutions for the following vibration problem with damping term* When F satisfies assumption (A) and four new existence conditions, One new existence theorem is obtained by the minimax methods incritical point theory.(* Indicates a formula, please see the full text) %K periodic solutions %K the minimax methods %K generalized mountain pass theorem %K condition %U http://journal.cqnu.edu.cn/1202/pdf/120212.pdf