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  1. 1
    Sven Hammer, Ryan Watson, The challenge of managing Spix Macaws (Cyanopsitta spixii) at Qatar - an eleven-year retrospection, Der Zoologische Garten, 2012, 81, 2-3, 81

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  2. 2
    Helen Rettmer, Amrita Deb, Ryan Watson, Jean-Michel Hatt, Sven Hammer, Radiographic Measurement of Internal Organs in Spix's Macaws (Cyanopsitta spixii), Journal of Avian Medicine and Surgery, 2011, 25, 4, 254

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