Sakshaug E., Hopkins C. C., and Øritsland N. A. “Proceedings of the Pro Mare Symposium on Polar Marine Ecology, Trondheim, Norway, 12-16 May 1990”. Polar Research, vol. 10, no. 1, Jan. 1991, pp. 1-4, doi:10.3402/polar.v10i1.6722.