M. Lodenius and S. Kuusela, “Mercury content in feathers of the Kestrel Falco tinnunculus L. in Finland”, Ornis Fenn, vol. 62, no. 4, pp. 158–160, Dec. 1985, Accessed: Jan. 03, 2026. [Online]. Available: https://ornisfennica.journal.fi/article/view/133192