https://chrome.google.com/webstore/detail/%E5%BC%80%E7%9C%BC/kpamljbkjaaljbcgobdealnpalcgicna?hl=zh-CN
https://chrome.google.com/webstore/detail/google-scholar-button/ldipcbpaocekfooobnbcddclnhejkcpn/related?hl=zh-CN
原文：http://www.cnblogs.com/zengkefu/p/6159328.html