Østreng, Willy; Eger, Karl Magnus; Fløistad, Brit; Jørgensen-Dahl, Arnfinn; Lothe, Lars; Mejlænder-Larsen, Morten; Wergeland, Tor (2013). Shipping in Arctic Waters: A Comparison of the Northeast, Northwest and Trans Polar Passages. Springer. doi:10.1007/978-3-642-16790-4. ISBN978-3642167898. S2CID41481012.
Østreng, Willy; Eger, Karl Magnus; Fløistad, Brit; Jørgensen-Dahl, Arnfinn; Lothe, Lars; Mejlænder-Larsen, Morten; Wergeland, Tor (2013). Shipping in Arctic Waters: A Comparison of the Northeast, Northwest and Trans Polar Passages. Springer. doi:10.1007/978-3-642-16790-4. ISBN978-3642167898. S2CID41481012.