Franson, J. C., Hollmén, M, T., Hario, M., Kilpi, M., & Finley, D. L. (2002). Lead and delta-aminolevulinic acid dehydratase in blood of Common Eiders (Somateria mollissima) from the Finnish archipelago. Ornis Fennica, 79(2), 87–91. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/133575