Vasilev, P. ., D. . Atanasova, and R. . Andreev. “Efficacy of Bioinsecticides Against the Hop Aphid Phorodon Humuli (Schrank) (Hemiptera: Aphididae) under Laboratory Conditions”. Canadian Journal of Agriculture and Crops, vol. 4, no. 2, Sept. 2019, pp. 130-5, doi:10.20448/803.4.2.130.135.