@ARTICLE{
author={Gutman Ivan,Vukicevic Damir,Zerovnik J},
year={2004},
title={A class of modified Wiener indices},
journal={CROATICA CHEMICA ACTA},
volume={77},
number={1-2},
pages={103-109},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Zerovnik J},
year={2002},
title={Corroborating a modification of the Wiener index},
journal={CROATICA CHEMICA ACTA},
volume={75},
number={2},
pages={603-612},
document_type={Article},
}