@ARTICLE{
author={Indulal Gopalapillai,Alex Liju,Gutman Ivan},
year={2021},
title={On graphs preserving PI index upon edge removal},
journal={JOURNAL OF MATHEMATICAL CHEMISTRY},
volume={59},
number={7},
pages={1603-1609},
document_type={Article},
} 

@ARTICLE{
author={Stevanovic Dragan P,Indulal Gopalapillai},
year={2009},
title={The distance spectrum and energy of the compositions of regular graphs},
journal={APPLIED MATHEMATICS LETTERS},
volume={22},
number={7},
pages={1136-1140},
document_type={Article},
} 

@ARTICLE{
author={Indulal Gopalapillai,Gutman Ivan,Vijayakumar Ambat},
year={2008},
title={On distance energy of graphs},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={60},
number={2},
pages={461-472},
document_type={Article},
} 

@ARTICLE{
author={Indulal Gopalapillai,Gutman Ivan},
year={2008},
title={On the distance spectra of some graphs},
journal={MATHEMATICAL COMMUNICATIONS},
volume={13},
number={1},
pages={123-131},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Indulal Gopalapillai,Todeschini Roberto},
year={2008},
title={Generalizing the McClelland bounds for total mu-electron energy},
journal={ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES},
volume={63},
number={5-6},
pages={280-282},
document_type={Article},
}