To cite package 'pgmm' in publications use:

Paul D. McNicholas, K. Raju Jampani, Aaron F. McDaid, T. Brendan Murphy and Larry Banks (2011). pgmm: Parsimonious Gaussian Mixture Models. R package version 1.0.
Paul D. McNicholas, K. Raju Jampani, Aaron F. McDaid, T. Brendan Murphy, Larry Banks. (2011). pgmm Version 1.0 for R: Model-based clustering and classification via latent Gaussian mixture models. Technical Report 2011-320, Department of Mathematics and Statistics, University of Guelph, Ontario, Canada.
Paul D. McNicholas and T. Brendan Murphy (2010). Model-based clustering of microarray expression data via latent Gaussian mixture models. Bioinformatics 26(21), 2705-2712.
Paul D. McNicholas (2010). Model-based classification using latent Gaussian mixture models. Journal of Statistical Planning and Inference 140(5), 1175-1181.
Paul D. McNicholas, T. Brendan Murphy, Aaron F. McDaid and Dermot Frost (2010). Serial and parallel implementations of model-based clustering via parsimonious Gaussian mixture models. Computational Statistics and Data Analysis 54(3), 711-723.
Paul D. McNicholas and T. Brendan Murphy (2008). Parsimonious Gaussian mixture models. Statistics and Computing 18(3), 285-296.
Paul D. McNicholas and T. Brendan Murphy (2005). Parsimonious Gaussian mixture models. Technical Report 05/11, Department of Statistics, Trinity College Dublin.

Corresponding BibTeX entries:

  @Manual{,
    title = {pgmm: Parsimonious Gaussian Mixture Models},
    author = {Paul D. McNicholas and K. Raju Jampani and Aaron F.
      McDaid and T. Brendan Murphy and Larry Banks},
    year = {2011},
    note = {R package version 1.0},
  }
  @TechReport{,
    title = {pgmm Version 1.0 for R: Model-based clustering and
      classification via latent Gaussian mixture models},
    author = {Paul D. McNicholas and T. Brendan Murphy and K. Raju
      Jampani and Aaron F. McDaid and Larry Banks},
    year = {2011},
    institution = {Department of Mathematics and Statistics, University
      of Guelph},
    address = {Ontario, Canada},
    number = {2011-320},
  }
  @Article{,
    title = {Model-Based Clustering of Microarray Expression Data via
      Latent Gaussian Mixture Models},
    author = {Paul D. McNicholas and T. Brendan Murphy},
    year = {2010},
    journal = {Bioinformatics},
    volume = {26},
    number = {21},
    pages = {2705--2712},
  }
  @Article{,
    title = {Model-Based Classification Using Latent Gaussian Mixture
      Models},
    author = {Paul D. McNicholas},
    year = {2010},
    journal = {Journal of Statistical Planning and Inference},
    volume = {140},
    number = {5},
    pages = {1175--1181},
  }
  @Article{,
    title = {Serial and Parallel Implementations of Model-Based
      Clustering via Parsimonious Gaussian Mixture Models},
    author = {Paul D. McNicholas and T. Brendan Murphy and Aaron F.
      McDaid and Dermot Frost},
    year = {2010},
    journal = {Computational Statistics and Data Analysis},
    volume = {54},
    number = {3},
    pages = {711--723},
  }
  @Article{,
    title = {Parsimonious Gaussian Mixture Models},
    author = {Paul D. McNicholas and T. Brendan Murphy},
    year = {2008},
    journal = {Statistics and Computing},
    volume = {18},
    number = {3},
    pages = {285--296},
  }
  @TechReport{,
    title = {Parsimonious Gaussian Mixture Models},
    author = {Paul D. McNicholas and T. Brendan Murphy},
    year = {2005},
    institution = {Department of Statistics, Trinity College Dublin},
    number = {05/11},
  }