Distribution, abundance, breeding parameters, threats and prey preferences of the eastern imperial eagle (Aquila heliaca) in European Turkey
Demerdzhiev, Dimitar, Dobrev, Dobromir, Stoychev, Stoycho, Terziev, Nikolay, Spasov, Svetoslav, Boev, Zlatozar, Stoychev, Stoycho
Status of the Gannet Morus bassanus in the Black Sea region (E Bulgaria)
Boev, Zlatozar