أرسل هذا في رسالة قصيرة: The nonlinear product of the bessel diamond operator and the bessel klein-gordon operator related to the bessel biharmonic equation

  ______    _____   __    __   __   __    ______  
 /_   _//  |  ___|| \ \\ / //  \ \\/ //  /_   _// 
 `-| |,-   | ||__    \ \/ //    \ ` //     | ||   
   | ||    | ||__     \  //      | ||     _| ||   
   |_||    |_____||    \//       |_||    /__//    
   `-`'    `-----`      `        `-`'    `--`