written and directed by Andreas Ewels, Norbert Porta ; production ZDF, Alexandre Kegler, Sigrid Beck ; produced by Norbert Porta Sciencedocu on behalf of ZDF
a co-production Zenit Arti Audiovisive, Skofteland Film, ZDF ; in collaboration with ARTE ; in association with NRK, Norwegian Broadcasting Corporation ... [and others] ; written and directed by Enrico Cerasuolo ; produced by Massimo Arvat
Bullfrog Films presents ; directed by David Springbett ; producers, David Springbett, Heather MacAndrew ; writer, Heather MacAndrew ; produced by Asterisk Productions ; produced in association with the Canadian Broadcasting Corporation