%0 Journal Article %T Vibration Characteristics of Ring-Stiffened Functionally Graded Circular Cylindrical Shells %A Muhmmad Nawaz Naeem %A Shazia Kanwal %A Abdul Ghafar Shah %A Shahid Hussain Arshad %J ISRN Mechanical Engineering %D 2012 %I Hindawi Publishing Corporation %R 10.5402/2012/232498 %U http://dx.doi.org/10.5402/2012/232498