WASET
Lhoucine, B. , Khalid, E. , Rhali, B.. "Geometrically Non-Linear Axisymmetric Free Vibrations of Thin Isotropic Annular Plates". World Academy of Science, Engineering and Technology, Open Science Index 81, International Journal of Mechanical and Mechatronics Engineering, (2013), 7(9), 1887 - 1893.