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Baillie, Stephen R.; Schaub, Michael (2009). Understanding changes in bird populations - the role of bird marking. Ringing & migration, 24(3), pp. 189-198. Thetford, UK: British Trust for Ornithology
Bairlein, Franz; Schaub, Michael (2009). Ringing and the study of mechanisms of migration. Ringing & migration, 24(3), pp. 162-168. Thetford, UK: British Trust for Ornithology
