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Aniolas Sruoga, Isaak Rashal, Dalius Butkauskas, Jānis Vīksne, Mečislovas Žalakevičius, Saulius Švažas and Monika Kaminskaitė

. Cramp, S., Simmons, K. (eds.). (1977). Handbook of the Birds of Europe, the Middle East and North Africa. Oxford: Oxford University Press. 722 pp. Delany, S., Scott, D. (2002). Waterbird Population Estimates. Third edition. Wetlands International Global Series, 12. Wageningen: Wetlands International. 226 pp. Kurlavičius, P. (ed.). (2006). Lithuanian Breeding Bird Atlas. Kaunas: Lutute. 251 pp. (in Lithuanian). Mednis, A., Viksne, J., Stipniece, A. (2003). Populations of Garganey and

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Jānis Vīksne, Māra Janaus and Aivars Mednis

-2), 154-158. Vīksne, J., Mednis, A., Janaus, M. (2000). Breeding duck numbers and breeding success at two Latvian Ramsar sites, Lakes Engure and Kanieris, in 1999. OMPO Newsletter , 22 , 25-39. Vīksne, J., Mednis, A., Janaus, M., Stīpniece, A. (2005). Changes in the breeding bird fauna, waterbird populations in particular, on Lake Engure (Latvia) over the last 50 years. Acta Zoologica Lituanica , 15 (2), 188-194. Vīksne, J., Laubergs, A. (2007). Mākslīgās ligzdvietas meža pīlei