@ARTICLE{Andreev_Radoslav_OCCURRENCE_2013,
 author={Andreev, Radoslav and Rasheva, Donka and Kutinkova, Hristina},
 volume={vol. 53},
 number={No 4},
 journal={Journal of Plant Protection Research},
 howpublished={online},
 year={2013},
 publisher={Committee of Plant Protection PAS},
 publisher={Institute of Plant Protection – National Research Institute},
 title={OCCURRENCE AND POPULATION DENSITY OF APHIDS IN APPLE ORCHARDS OF SOUTH BULGARIA},
 URL={http://journals.pan.pl/Content/89237/PDF/JPPR_53(4)_08_Andreev.pdf},
 doi={10.2478/jppr-2013-0053},
}