To cite CEMiTool in publications use:

  Pedro S. T. Russo, Gustavo R. Ferreira, Lucas E. Cardozo, Matheus C.
  Burger, Raul Arias-Carrasco, Sandra R. Maruyama, Thiago D. C. Hirata,
  Diogenes S. Lima, Fernando M. Passos, Kiyoshi F. Fukutani, Melissa
  Lever, Joao S. Silva, Vinicius Maracaja-Coutinho Helder I. Nakaya
  CEMiTool: a Bioconductor package for performing comprehensive modular
  co-expression analyses BMC Bioinformatics, 19:56, 1-13. URL
  https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-018-2053-1

A BibTeX entry for LaTeX users is

  @Article{,
    title = {CEMiTool: a Bioconductor package for performing comprehensive modular co-expression analyses},
    author = {Pedro de Sa Tavares Russo and Gustavo Rodrigues Ferreira and Lucas Esteves Cardozo and Matheus Carvalho Burger and Raul Arias-Carrasco and Sandra Regina Maruyama and Thiago Dominguez Crespo Hirata and Diogenes Saulo Lima and Fernando Marcon Passos and Kiyoshi Ferreira Fukutani and Melissa Lever and Joao Santana Silva and Vinicius Maracaja-Coutinho and Helder Takashi Imoto Nakaya},
    journal = {BMC Bioinformatics},
    year = {2018},
    volume = {19},
    number = {56},
    pages = {1--13},
    doi = {10.1186/s12859-018-2053-1},
    url = {https://doi.org/10.1186/s12859-018-2053-1},
  }