Kular, J.S. et al. 2012. Population development of turnip aphid Lipaphis erysimi (Kaltenbach, 1843) (Hemiptera: Aphididae) and the associated predator Coccinella septempunctata Linnaeus, 1758 as affected by changes in sowing dates of oilseed Brassica. ENTOMOTROPICA. 27, 1 (sep. 2012), 19–25.