@article{KalsMontadaBeckeretal.1999,
  author    = {Kals, Elisabeth and Montada, Leo and Becker, Ralf and Ittner, Heidi},
  title     = {Verantwortung f{\"u}r den Schutz von Allmenden},
  year      = {1999},
  language  = {de}
}
@article{MontadaKalsBecker1999,
  author    = {Montada, Leo and Kals, Elisabeth and Becker, Ralf},
  title     = {Trierer Bereitschaftsskalen zum Umwelt- und Gesundheitsschutz (TBUG)},
  year      = {1999},
  language  = {de}
}