@ARTICLE{
author={Ivkovic Ivan S,Janjos Zeljko,Zezelj Srecko,Jovanovic Vojkan D},
year={2011},
title={Research into the costs of vehicle exhaust gases from the standpoint of using natural gas-powered buses},
journal={AFRICAN JOURNAL OF BUSINESS MANAGEMENT},
volume={5},
number={22},
pages={9304-9321},
document_type={Article},
}