@ARTICLE{
author={Kostic Zona,Radakovic Dusko,Cvetkovic Dragan,Jevremovic Aleksandar,Markovic Dragan S,Kocareva-Ranisavljev Marina},
year={2015},
title={Web-based Laboratory for Collaborative and Concurrent Cad Designing, Assembling, and Practical Exercising on Distance},
journal={TEHNICKI VJESNIK-TECHNICAL GAZETTE},
volume={22},
number={3},
pages={591-597},
document_type={Article},
} 

@ARTICLE{
author={Kostic Zona,Cvetkovic Dragan,Jevremovic Aleksandar,Radakovic Dusko,Popovic Ranko M,Markovic Dragan S},
year={2013},
title={The Development of Assembly Constraints Within a Virtual Laboratory for Collaborative Learning in Industrial Design},
journal={TEHNICKI VJESNIK-TECHNICAL GAZETTE},
volume={20},
number={5},
pages={747-753},
document_type={Article},
} 

@ARTICLE{
author={Cvetkovic Dragan,Radakovic Dusko},
year={2007},
title={Mathematical models of helicopter flight dynamics},
journal={STROJNISKI VESTNIK-JOURNAL OF MECHANICAL ENGINEERING},
volume={53},
number={2},
pages={114-126},
document_type={Article},
}