To cite the IPO package in publications use:

Libiseller, Dvorzak, Kleb, Gander, Eisenberg, Madeo, Neumann, Trausinger, Sinner, Pieber, Magnes IPO: A Tool for automated Optimization of XCMS Parameters BMC Bioinformatics (accepted)

Corresponding BibTeX entry:

  @Article{,
    author = {Gunnar Libiseller and Michaela Dvorzak and Ulrike Kleb
      and Edgar Gander and Tobias Eisenberg and Frank Madeo and Steffen
      Neumann and Gert Trausinger and Frank Sinner and Thomas Pieber
      and Christoph Magnes},
    title = {IPO: a tool for automated optimization of XCMS
      parameters},
    journal = {BMC Bioinformatics},
    year = {(2015)},
    volume = {16},
    pages = {118},
  }