Le, G.; J. A. Slavin; R. J. Strangeway (2010). «Space Technology 5 observations of the imbalance of regions 1 and 2 field-aligned currents and its implication to the cross-polar cap Pedersen currents». J. Geophys. Res. 115 (A07202): n/a. Bibcode:2010JGRA..11507202L. doi:10.1029/2009JA014979.
enciclopedia.cat
Gran Enciclopèdia Catalana, oppført som Olaf Kristian Birkeland, Gran Enciclopèdia Catalana-ID 0010182[Hentet fra Wikidata]
enciklopedija.hr
Hrvatska enciklopedija, Hrvatska enciklopedija-ID 7835, oppført som Olaf Kristian Birkeland[Hentet fra Wikidata]
Le, G.; J. A. Slavin; R. J. Strangeway (2010). «Space Technology 5 observations of the imbalance of regions 1 and 2 field-aligned currents and its implication to the cross-polar cap Pedersen currents». J. Geophys. Res. 115 (A07202): n/a. Bibcode:2010JGRA..11507202L. doi:10.1029/2009JA014979.