The first comprehensive estimate of the winter population of the White-tailed Eagle Haliaeetus albicilla along the Danube/ Prva celostna ocena zimske populacije belorepca Haliaeetus albicilla vzdolž Donave
Probst, Remo, Bogdea, Larisa, Bandacu, Dan S., Bohuš, Mirko, Cheshmedzhiev, Svilen, Gáborik, Ákos, Geissler, Siegfried, Hodor, Calin V., Ionescu, Dan T., Koev, Veselin, Mikuska, Tibor, Nagy, Zsolt, Parrag, Tibor, Rožac, Vlatko, Schmidt, Matthias, Schneider, Thomas, Šćiban, Marko, Tatai, Sándor, Todorov, Emil, Tomik, Adrian, Tucakov, Marko, Váczi, Miklós, Frank, Georg
Characteristics of soaring birds' spring migration over inland SE Bulgaria
Shurulinkov, Peter, Daskalova, Girgina, Chakarov, Nayden, Hristov, Krassimir, Dyulgerova, Silvia, Gocheva, Yana, Cheshmedzhiev, Svilen, Madzharov, Minko, Dimchev, Ivailo