“NEW DATA ON THE GENUS SYRPHUS FABRICIUS, 1775 (DIPTERA: SYRPHIDAE) FROM THE BALKAN PENINSULA INCLUDING THE FIRST RECORD OF SYRPHUS NITRIDIFRONS BECKER, 1921”, Acta Ent Serb, vol. 15, no. 1, pp. 91–105, May 2010, Accessed: Sep. 14, 2025. [Online]. Available: http://147.91.73.126/index.php/aes/article/view/113