The Batumi Raptor Count monitors the autumn migration of more than 1 million raptors including thousands of ST Eagles along the eastern Black Sea coast in Georgia at the Batumi bottleneck /map/.
• Wouter M.G. VANSTEELANT, Jasper WEHRMANN, Dries ENGELEN, Johannes JANSEN, Brecht VERHELST, Rafa BENJUMEA, Simon CAVAILLÈS, Triin KAASIKU, Bart HOEKSTRA & Folkert de BOER, 2019 – Accounting for differential migration strategies between age groups to monitor raptor population dynamics in the eastern Black Sea flyway // Ibis. doi:10.1111/ibi.12773 – 
(En).
Also, other publications are available at the BRC site.