Folkestad, Knut (18 Feb 2009). "Fra Svartisen til Ekvator" (بالنرويجية). Norwegian Broadcasting Corporation. Archived from the original on 2016-11-10. Retrieved 2016-11-09.
Folkestad, Knut (18 Feb 2009). "Fra Svartisen til Ekvator" (بالنرويجية). Norwegian Broadcasting Corporation. Archived from the original on 2016-11-10. Retrieved 2016-11-09.