Wide fluctuations in the Finnish population of the Great Grey Shrike Lanius excubitor during recent decades
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Hildén, O., & Hildén, M. (1996). Wide fluctuations in the Finnish population of the Great Grey Shrike Lanius excubitor during recent decades. Ornis Fennica, 73(1), 35–38. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/133436