發送短信

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

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發送短信 : A scientometric study and social network analysis of Donald E. Knuth.