أرسل هذا في رسالة قصيرة: Global Stabilization of a Class of Time-Delay Nonlinear Systems with Unknown Control Directions by Nonsmooth Feedback<sup>⁎</sup>

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