Translocations of European ground squirrel (Spermophilus citellus) along altitudinal gradient in Bulgaria – an overview

by Yordan Koshev, Maria Kachamakova, Simeon Arangelov, Dimitar Ragyov
Published 2019-06-01

Habitat preferences of diurnal raptors in relation to human access to their breeding territories in the Balkan Mountain Range, Bulgaria

by Nadejda Djorgova, Dimitar Ragyov, Valko Biserkov, Jordan Biserkov, Boris P. Nikolov
Published 2021-06-01