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

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發送短信 : On kirchhoff's model of parabolic type