/usr/lib/R/site-library/lmerTest/CITATION is in r-cran-lmertest 2.0-36-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | bibentry(bibtype = "Article",
  title        = "{lmerTest} Package: Tests in Linear Mixed Effects Models",
  author       = c(person(given = "Alexandra",
                          family = "Kuznetsova",
                          email = "alku@dtu.dk"),
                   person(given = c("Per", "B."),
                          family = "Brockhoff",
			  email = "perbb@dtu.dk"),
                   person(given = c("Rune", "H.", "B."),
                          family = "Christensen",
                          email = "Rune@ChristensenStatistics.dk")),
  journal      = "Journal of Statistical Software",
  year         = "2017",
  volume       = "82",
  number       = "13",
  pages        = "1--26",
  doi          = "10.18637/jss.v082.i13",
  header       = "To cite lmerTest in publications use:"
)
 |