Olivero, J., Real, R. and Vargas, J. M. (1998) “Distribution of breeding, wintering, and resident waterbirds in Europe: biotic regions and the macroclimate”, Ornis Fennica, 75(4), pp. 153–175. Available at: https://ornisfennica.journal.fi/article/view/133489 (Accessed: 22November2024).