====== R ======
  * [[http://r4ds.had.co.nz/index.html|R for Data Science]]
  * [[https://campus.datacamp.com/courses/free-introduction-to-r/chapter-2-vectors-2?ex=6|Free intro to R]] от datacamp
  * [[https://habr.com/post/345664/|Добыча данных в R]]