أرسل هذا في رسالة قصيرة: Distributed control of nonlinear systems with unknown time-varying control coefficients: a novel Nussbaum function approach

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