To cite package ‘diffHic’ in publications use:

  Lun ATL and Smyth GK (2015). diffHic: a Bioconductor package to
  detect differential genomic interactions in Hi-C data. BMC
  Bioinformatics 16, 258.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Aaron T L Lun and Gordon K Smyth},
    title = {diff{H}ic: a {B}ioconductor package to detect differential genomic interactions in {H}i-{C} data},
    journal = {BMC Bioinformatics},
    year = {2015},
    volume = {16},
    pages = {258},
  }