Lehtilä, K., K. Ennola, and K. Syrjänen. “The Effect of Summer Cottages on Land Bird Numbers in a Finnish Archipelago”. Ornis Fennica 73, no. 2 (July 1, 1996): 49–59. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133437.