NEDELJKOVIĆ, Z.; VUJIĆ, A.; RICARTE, A.; RADENKOVIĆ, S.; ŠIMIĆ, S. NEW DATA ON THE GENUS SYRPHUS FABRICIUS, 1775 (DIPTERA: SYRPHIDAE) FROM THE BALKAN PENINSULA INCLUDING THE FIRST RECORD OF SYRPHUS NITRIDIFRONS BECKER, 1921. Acta Entomologica Serbica, v. 15, n. 1, p. 91-105, 25 maio 2010.