To cite hydropeak in publications use:

Franz Greimel et al. A method to detect and characterize sub-daily flow fluctuations. Hydrological Processes, 30(13), 2063-2078, 2016.<doi:10.1002/hyp.10773>

Corresponding BibTeX entry:

  @Article{,
    title = {{A Method to Detect and Characterize Sub-Daily Flow
      Fluctuations}},
    author = {Franz Greimel and Bernhard Zeiringer and Norbert H\"oller
      and Bettina Gr\"un and Reinhold Godina and Stefan Schmutz},
    journal = {Hydrological Processes},
    year = {2016},
    volume = {30},
    number = {13},
    pages = {2063--2078},
    doi = {10.1002/hyp.10773},
  }