To cite package ‘altcdfenvs’ in publications use:

  Alternative mapping of probes to genes for Affymetrix chips Laurent
  Gautier, Morten Mooller, Lennart Friis-Hansen, Steen Knudsen BMC
  Bioinformatics 2004, 5:111 (14 August 2004)

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Laurent Gautier and Morten Mooller and Lennart Friis-Hansen and Steen Knudsen},
    title = {Alternative mapping of probes to genes for {\it Affymetrix} chips},
    journal = {BMC Bioinformatics},
    year = {2004},
    note = {5:111 (14 August 2004)},
  }