@ARTICLE{
author={Janosevic Dragoslav B,Mitrev Rosen,Andjelkovic Boban R,Petrov Plamen},
year={2012},
title={Quantitative measures for assessment of the hydraulic excavator digging efficiency},
journal={JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A},
volume={13},
number={12},
pages={926-942},
document_type={Article},
} 

@ARTICLE{
author={Ivanova Evgeniya N,Bouga Maria,Staykova Teodora,Mladenovic Mica A,Rasic Sladjan B,Charistos Leonidas,Hatjina Fani,Petrov Plamen},
year={2012},
title={The genetic variability of honey bees from the Southern Balkan Peninsula, based on alloenzymic data},
journal={JOURNAL OF APICULTURAL RESEARCH},
volume={51},
number={4},
pages={329-335},
document_type={Article},
}