Literature
, 2004. Fluctuations in sandeel biomass at Shetland: implications for the commercial fishery and breeding seabirds. , 61, pp.788 - 797. Available at: https://www.researchgate.net/publication/230648157_Fluctuations_in_sandeel_biomass_at_Shetland_implications_for_the_commercial_fishery_and_breeding_seabirds.