@ARTICLE{
author={Heidari Dariush,Rostami Mohammadreza,Gutman Ivan,Alex Liju},
year={2026},
title={New Results on Second Inverse Sum Indeg Index},
journal={IRANIAN JOURNAL OF MATHEMATICAL CHEMISTRY},
volume={17},
number={2},
pages={113-128},
document_type={Article},
} 

@ARTICLE{
author={Alex Liju,Gutman Ivan,Heidari Dariush,Rostami Mohammadreza},
year={2025},
title={On the square PI index of graphs},
journal={DISCRETE MATHEMATICS LETTERS},
volume={16},
number={},
pages={73-79},
document_type={Article},
}