發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : On a necessary and sufficient identification condition of optimal treatment regimes with an instrumental variable