[1] https://knowlab.wordpress.com/2016/12/15/以-r-markdown-輕鬆編輯資料分析報告(下)/
[2] https://stackoverflow.com/questions/1759956/curl-error-18-transfer-closed-with-outstanding-read-data-remaining
[3] https://stackoverflow.com/questions/48990770/error-in-publishing-to-rpubs-from-rstudio
[4] http://rstudio-pubs-static.s3.amazonaws.com/25030_8e9c9ffc3b3c423d9381d81543423502.html