https://purengom.com/2011/07/29/evernote-gtd%eb%a1%9c-%eb%8b%b9%ec%8b%a0%ec%9d%98-%ed%8c%94%eb%8b%a4%eb%a6%ac%eb%a5%bc-%ec%96%b4%eb%96%bb%ea%b2%8c-%ec%9b%80%ec%a7%81%ec%9d%b4%ea%b2%8c-%ed%95%a0%ec%a7%80-%ec%a7%80%ec%8b%9c%ed%95%98/