To cite package 'Pigengene' in publications use:

  Amir Foroushani et al.(2016) Large-scale gene network analysis
  reveals the significance of extracellular matrix pathway and homeobox
  genes in acute myeloid leukemia: an introduction to the Pigengene
  package and its applications, Foroushani et al., BMC Medical
  Genomics. URL:
  https://bmcmedgenomics.biomedcentral.com/articles/10.1186/s12920-017-0253-6.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Amir Foroushani and et al.},
    title = {{Large-scale gene network analysis reveals the significance of extracellular matrix pathway and homeobox genes in acute myeloid leukemia: an introduction to the Pigengene package and its applications}},
    journal = {BMC Medical Genomics},
    year = {2017},
    volume = {10},
    number = {1},
    pages = {16},
    month = {3},
  }