@article{FreiseRoettgers2005,
  author    = {Freise, Jona and R{\"o}ttgers, Hanns R{\"u}diger},
  title     = {Ausgangspunkt Landwirtschaft},
  series = {DPS},
  journal   = {DPS},
  number    = {5},
  pages     = {6 -- 10},
  year      = {2005},
  language  = {mul}
}
@article{FreiseRoettgersWehlage2006,
  author    = {Freise, Jona and R{\"o}ttgers, Hanns R{\"u}diger and Wehlage, Dieter},
  title     = {Schabenbefall in Damme- R{\"u}ckblick},
  series = {DPS},
  journal   = {DPS},
  number    = {2},
  year      = {2006},
  language  = {mul}
}