أرسل هذا في رسالة قصيرة: Development of Green's functions and its application for cylindrically stratified media

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