@ARTICLE{
author={Yovkova Mariya,Pencheva Aneliya,Petrovic-Obradovic Olivera T},
year={2019},
title={First Records of Two Species of the Genus Illinoia Wilson, 1910 (Hemiptera: Aphididae) in Bulgaria},
journal={ACTA ZOOLOGICA BULGARICA},
volume={71},
number={2},
pages={293-296},
document_type={Article},
} 

@ARTICLE{
author={Yovkova Mariya,Pencheva Aneliya,Petrovic-Obradovic Olivera T},
year={2016},
title={First Record of Elatobium abietinum (Walker, 1849) (Hemiptera, Sternoryncha, Aphididae) on Picea spp. in Bulgaria},
journal={ACTA ZOOLOGICA BULGARICA},
volume={68},
number={1},
pages={135-138},
document_type={Article},
} 

@ARTICLE{
author={Yovkova Mariya,Petrovic-Obradovic Olivera T,Tasheva-Terzieva Elena,Pencheva Aneliya},
year={2013},
title={Aphids (Hemiptera, Aphididae) on ornamental plants in greenhouses in Bulgaria},
journal={ZOOKEYS},
volume={},
number={319},
pages={347-361},
document_type={Article},
}