@ARTICLE{
author={Gojak Sabina,Gutman Ivan,Radenkovic Slavko,Vodopivec Andrej},
year={2007},
title={Relating resonance energy with the Zhang-Zhang polynomial},
journal={JOURNAL OF THE SERBIAN CHEMICAL SOCIETY},
volume={72},
number={7},
pages={665-671},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Radenkovic Slavko,Trinajstic N,Vodopivec Andrej},
year={2006},
title={On the relationship between pi-electron energy and topological resonance energy},
journal={ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL},
volume={61},
number={7-8},
pages={345-348},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Vodopivec Andrej,Radenkovic Slavko,Furtula Boris},
year={2006},
title={On pi-electron excess of rings of benzenoid molecules},
journal={INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY},
volume={45},
number={2},
pages={347-351},
document_type={Article},
}