To cite package 'cardidates' in publications use:

Rolinski S, Horn H, Petzoldt T, Paul L (2007). “Identifying cardinal dates in phytoplankton time series to enable the analysis of long-term trends.” Oecologia, 153(4), 997–1008. doi:10.1007/s00442-007-0783-2.

Corresponding BibTeX entry:

  @Article{,
    author = {Susanne Rolinski and Heidemarie Horn and Thomas Petzoldt
      and Lothar Paul},
    title = {Identifying cardinal dates in phytoplankton time series to
      enable the analysis of long-term trends},
    journal = {Oecologia},
    year = {2007},
    volume = {153},
    pages = {997--1008},
    number = {4},
    doi = {10.1007/s00442-007-0783-2},
    keywords = {Spring mass development, Climate change, Saidenbach
      Reservoir, Limnology, Physical-biological coupling, Peak
      detection},
  }