To cite oppar in publications use:

  Wang, C., Taciroglu, A., Maetschke, S. R., Nelson, C. C., Ragan, M.
  A., & Davis, M. J. (2012). mCOPA: analysis of heterogeneous features
  in cancer expression data. Journal of Clinical Bioinformatics, 2, 22.
  http://doi.org/10.1186/2043-9113-2-22

A BibTeX entry for LaTeX users is

  @Article{,
    title = {mCOPA: analysis of heterogeneous features in cancer expression data},
    author = {Chenwei Wang and Alperen Taciroglu and Stefan R Maetschke and Colleen C Nelson and Mark A Ragan and Melissa J Davis},
    journal = {Journal of Clinical Bioinformatics},
    year = {2012},
    volume = {2},
    number = {22},
    url = {http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3553066/},
  }