To cite gMWT in publications use:

Daniel Fischer, Hannu Oja (2015). Mann-Whitney Type Tests for Microarray Experiments: The R Package gMWT. Journal of Statistical Software, 65(9), 1-19. URL http://www.jstatsoft.org/v65/i01/.

Corresponding BibTeX entry:

  @Article{,
    title = {Mann-Whitney Type Tests for Microarray Experiments: The
      {R} Package {gMWT}},
    author = {Daniel Fischer and Hannu Oja},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {65},
    number = {9},
    pages = {1--19},
    url = {http://www.jstatsoft.org/v65/i01/},
  }