أرسل هذا في رسالة قصيرة: Free vibration of exponential functionally graded beams with single delamination

  _____    _    _     ____     _    _     ______  
 / ____|| | || | ||  |  _ \\  | || | ||  /_____// 
/ //---`' | || | ||  | |_| || | || | ||  `____ `  
\ \\___   | \\_/ ||  | .  //  | \\_/ ||  /___//   
 \_____||  \____//   |_|\_\\   \____//   `__ `    
  `----`    `---`    `-` --`    `---`    /_//     
                                         `-`