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 __   _    __   __   __   __    _____             
| || | ||  \ \\/ //  \ \\/ //  |  ___||     ___   
| '--' ||   \ ` //    \   //   | ||__      /   || 
| .--. ||    | ||     / . \\   | ||__     | [] || 
|_|| |_||    |_||    /_//\_\\  |_____||    \__ || 
`-`  `-`     `-`'    `-`  --`  `-----`      -|_|| 
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Text this: Local stability of limit cycles for time-delay relay-feedback systems