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Lykouressis, D.P. and Polatsidis C.Ρ. 1990. Seasonal abundance of Acyrthosiphon pisum (Harris) (Homoptera: Aphididae) and Therioaphis trifolii (Monell) (Homoptera: Gallaphididae) on lucerne in Central Greece. ENTOMOLOGIA HELLENICA. 8, (Jan. 1990), 41–46. DOI:https://doi.org/10.12681/eh.13980.