To cite 'oposSOM' in publications use:

Loeffler-Wirth H, Kalcher M, Binder H: oposSOM: R-package for high-dimensional portraying of genome-wide expression landscapes on Bioconductor.Bioinformatics 2015.

Corresponding BibTeX entry:

  @Article{,
    title = {oposSOM: R-package for high-dimensional portraying of
      genome-wide expression landscapes on Bioconductor.},
    author = {Henry Loeffler-Wirth and Martin Kalcher and Hans Binder},
    journal = {Bioinformatics},
    year = {2015},
  }