This article mentioned here in 2006 is available online now:
• Graham R. MARTIN & Gadi KATZIR, 1999 – Visual Fields in Short-Toed Eagles, Circaetus gallicus (Accipitridae), and the Function of Binocularity in Birds // Brain, Behavior and Evolution, 53: pp. 55-66. – 
(En).
Some other articles on the ResearchGate portal will be represented here soon.