Lorenzana, A., A. Hermoso-de-Mendoza, M. V. Seco, and P. A. Casquero. “Population Dynamics and Integrated Control of the Damson-Hop Aphid Phorodon Humuli (Schrank) on Hops in Spain”. Spanish Journal of Agricultural Research, Vol. 11, no. 2, Apr. 2013, pp. 505-17, doi:10.5424/sjar/2013112-2968.