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Rettmer, H; Deb, A; Watson, R; Hatt, Jean-Michel; Hammer, S (2011). Radiographic measurement of internal organs in Spix’s Macaws (Cyanopsitta spixii). Journal of Avian Medicine and Surgery, 25(4):254-258.
Tschudin, A; Rettmer, H; Watson, R; Clauss, Marcus; Hammer, S (2010). Evaluation of hand-rearing records for Spix’s macaw Cyanopsitta spixii at the Al Wabra Wildlife Preservation from 2005 to 2007. International Zoo Yearbook, 44:201-211.
Sachs, J D; Baillie, J E M; Sutherland, W J; Armsworth, P R; Ash, N; Beddington, J; Blackburn, Tim M; Collen, B; Gardiner, B; Gaston, K J; Godfray, H C J; Green, R E; Harvey, P H; House, B; Knapp, S; Kumpel, N F; Macdonald, D W; Mace, G M; Mallet, J; Matthews, A; May, R M; Petchey, O; Purvis, A; Roe, D; Safi, K; Turner, K; Walpole, M; Watson, R; Jones, K E (2009). Biodiversity conservation and the millennium development goals. Science, 325(5947):1502-1503.
Wyss, F; Deb, A; Watson, R; Hammer, S (2009). Radiographic measurements for PDD diagnosis in Spix's macaws (Cyanospitta spixii) at Al Wabra Wildlife Preservation (AWWP), Qatar. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 349-354.