To cite package ‘getDEE2’ in publications use:

  Ziemann, M., Kaspi, A., El-Osta, A. Digital expression explorer 2: a
  repository of uniformly processed RNA sequencing data Gigascience
  8(2019):1-13 (2019)

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Digital expression explorer 2: a repository of uniformly processed RNA sequencing data},
    author = {Mark Ziemann and Antony Kaspi and Assam El-Osta},
    year = {2019},
    journal = {Gigascience},
    doi = {10.1093/gigascience/giz022},
    volume = {8},
    issue = {2019},
    pages = {-12},
  }