Bug-Submit: https://github.com/yihui/knitr/issues/new
Reference:
  Author: Yihui Xie
  Booktitle: Dynamic Documents with R and knitr
  Year: 2013
  ISBN: 978-1482203530
  URL: http://www.crcpress.com/product/isbn/9781482203530
Archive: CRAN
Bug-Database: https://github.com/yihui/knitr/issues
