2009

Koshev Y. 2009. Distribution, isolation and recent status of European ground squirrel (Spermophilus citellus L.) in Pazardzhik district, Bulgaria. Annual of Shumen University “Konstantin Preslavsky”, Faculty of Natural Science, XIX B6: 97-109. (full pdf).

Golemansky V., Y. Koshev. 2009. Systematic and ecological survey on coccidians (Apicomplexa: Eucoccidida) in European ground squirrel (Spermophilus citellus L.) (Rodentia: Sciuridae) from Bulgaria. – Acta Zoologica Bulgarica, 61 (2): 141-148. (full pdf).

2008

Koshev Y. 2008. Distribution and status of European ground squirrel (Spermophilus citellus) in Bulgaria. - Lynx (Praha), n.s., 39 (2): 251-261. (full pdf)

Kоshev Y., I. Pandourski. 2008. Structure and variability of alarm calls of European ground squirrel Spermophilus citellus L. 1766 (Mammalia: Rodentia) from Western Bulgaria. – Acta Zoologica Bulgarica, 60, 1: 99-105. (full pdf)

Koshev Y., M. Kocheva. 2008. Daily activity pattern in free-living European ground squirrels Spermophilus citellus (Mammalia: Rodentia) from Northwestern Bulgaria. – Acta Zoologica Bulgarica, suppl. 2: 149-154. (full pdf)

2007

Koshev Y., M. Kocheva. 2007. Environmental factors and distribution of European ground squirrel (Spermophilus citellus) in Bulgaria. – Journal "Ecology & Safety. International Scientific Publications", 1, 276-287. (full pdf)

Golemansky V., Y. Koshev. 2007. Coccidian parasites (Eucoccidia: Eimeriidae) of European ground squirrel (Spermophilus citellus L., 1766) (Rodentia: Sciuridae) from Bulgaria. – Acta Zoologica Bulgarica, 59, 1: 81-85. (full pdf)

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