Tavoosi Ajvad, F., Madadi, H., Gharali, B., Kazzazi, M.. “Multiple predation effects of Episyrphus balteatus (Dip., Syrphidae) and Hippodamia variegata (Col., Coccinellidae) on Aphis gossypii  (Hem.: Aphididae) population.” IAU Entomological Research Journal, vol. 5, no. 1, 2013, pp. 51-59.