1. Allaire, J., et al.: rmarkdown: Dynamic Documents for R (2018).
https://CRAN.R-project.org/package=rmarkdown
, r package version 1.10
2. Lecture Notes in Computer Science (Lecture Notes in Artificial Intelligence);R Arun,2010
3. Benoit, K., Muhr, D., Watanabe, K.: stopwords: Multilingual Stopword Lists (2017).
https://CRAN.R-project.org/package=stopwords
, r package version 0.9.0
4. Blei, D.M., Ng, A.Y., Jordan, M.I.: Latent dirichlet allocation. J. Mach. Learn. Res. 3, 993–1022 (2003)
5. Bouchet-Valat, M.: SnowballC: Snowball stemmers based on the C libstemmer UTF-8 library (2014).
https://CRAN.R-project.org/package=SnowballC
, r package version 0.5.1