To cite package 'isa2' in publications use:

Csardi G, Kutalik Z, Bergmann S: Modular analysis of gene expression data with R Bioinformatics. 2010. 26 1376-7
Bergmann S, Ihmels J, Barkai N: Iterative signature algorithm for the analysis of large-scale gene expression data Phys Rev E Stat Nonlin Soft Matter Phys. 2003Mar;67(3 Pt 1):031902. Epub 2003 Mar 11.

Corresponding BibTeX entries:

  @Article{,
    title = {Modular analysis of gene expression data with R},
    author = {Gabor Csardi and Zoltan Kutalik and Sven Bergmann},
    journal = {Bioinformatics},
    year = {2010},
    volume = {26},
    pages = {1376-7},
  }
  @Article{,
    title = {Iterative signature algorithm for the analysis of
      large-scale gene expression data},
    author = {Sven Bergmann and Jan Ihmels and Naama Barkai},
    journal = {Phys Rev E Nonlin Soft Matter Phys},
    year = {2003},
    pages = {031902},
  }