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Deb, A; Foldenauer, U; Borjal, R J; Streich, W J; Lüken, C; Johne, R; Müller, H; Hammer, S (2010). A longitudinal study on avian polyomavirus-specific antibodies in captive Spix's macaws (Cyanopsitta spixii). Journal of Avian Medicine and Surgery, 24(3):192-198.