To cite package ‘coGPS’ in publications use:

  Cancer Outlier Gene Profile Sets Elucidate Pathways in Head and Neck
  Squamous Cell Carcinoma. Wei, Y., Hennessey, P., Gaykalova, D.,
  Califano, J.A., Ochs, M.F. 2011, Technical Report, Johns Hopkins
  University, Department of Biostatistics

A BibTeX entry for LaTeX users is

  @TechReport{,
    author = {Yingying Wei and Patrick Hennessey and Daria Gaykalova and Joseph A. Califano and Michael F.Ochs},
    title = {Cancer Outlier Gene Profile Sets Elucidate Pathways in Head and Neck Squamous Cell Carcinoma.},
    institution = {Johns Hopkins University, Department of Biostatistics},
    year = {2011},
    type = {Technical report},
  }