發送短信 : Local stability of limit cycles for time-delay relay-feedback systems

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