@ARTICLE{
author={Ralic Zivko N,Radojicic Miroslav,Nesic Zoran,Milanovic Dragan D,Milanovic Dragan Lj},
year={2012},
title={Selection of Central Heating Systems with the Increase of the Energy Efficiency},
journal={METALURGIA INTERNATIONAL},
volume={17},
number={4},
pages={201-208},
document_type={Article},
} 

@ARTICLE{
author={Ralic Zivko N,Radojicic Miroslav,Nesic Zoran,Milanovic Dragan D,Milanovic Dragan Lj},
year={2011},
title={Development of a model for optimization of central heating system selection},
journal={TECHNICS TECHNOLOGIES EDUCATION MANAGEMENT-TTEM},
volume={6},
number={2},
pages={432-437},
document_type={Article},
}