Nikolova, I., and N. Georgieva. “Effects of Biological Insecticides NeemAzal T/S and Pyrethrum FS EC and Their Interaction With Organic Products in Treatments of Pea Aphid Acyrthosiphon Pisum (Harris) (Hemiptera: Aphididae) on Pisum Sativum (L.)”. Pesticides and Phytomedicine / Pesticidi I Fitomedicina, Vol. 29, no. 3, Dec. 2014, doi:10.2298/pif.v29i3.6385.