a film by Andreas Ewels, Norbert Porta ; written by Andreas Ewels, Norbert Porta ; production ZDF, Alexandre Kegler, Sigrid Beck ; produced by Norbert Porta Sciencedocu on behalf of ZDF
a report by Claus Schenk ; written and directed by Claus Schenk ; production, Alexandre Kegler, Sigrid Beck ; produced by CapricornFilm on behalf of ZDF