"Konsekvenser for luftfart"(PDF) (in Norwegian). Avinor. October 2012. pp. 44–45. Archived from the original(PDF) on 1 November 2013. Retrieved 25 January 2012.
"Konsekvenser for luftfart"(PDF) (in Norwegian). Avinor. October 2012. pp. 44–45. Archived from the original(PDF) on 1 November 2013. Retrieved 25 January 2012.