@ARTICLE{
author={Abdo Hosam,Dimitrov Darko,Gutman Ivan},
year={2019},
title={Graph irregularity and its measures},
journal={APPLIED MATHEMATICS AND COMPUTATION},
volume={357},
number={},
pages={317-324},
document_type={Article},
} 

@ARTICLE{
author={Abdo Hosam,Dimitrov Darko,Gutman Ivan},
year={2018},
title={Graphs with maximal sigma irregularity},
journal={DISCRETE APPLIED MATHEMATICS},
volume={250},
number={},
pages={57-64},
document_type={Article},
} 

@ARTICLE{
author={Abdo Hosam,Dimitrov Darko,Gutman Ivan},
year={2017},
title={On extremal trees with respect to the F-index},
journal={KUWAIT JOURNAL OF SCIENCE},
volume={44},
number={3},
pages={1-8},
document_type={Article},
} 

@ARTICLE{
author={Abdo Hosam,Dimitrov Dark,Reti Tamas,Stevanovic Dragan P},
year={2014},
title={Estimating the Spectral Radius of a Graph by the Second Zagreb Index},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={72},
number={3},
pages={741-751},
document_type={Article},
} 

@ARTICLE{
author={Abdo Hosam,Dimitrov Darko,Gutman Ivan},
year={2012},
title={On the Zagreb indices equality},
journal={DISCRETE APPLIED MATHEMATICS},
volume={160},
number={1-2},
pages={1-8},
document_type={Article},
}