Indulal Gopalapillai,Alex Liju,Gutman Ivan (2021) On graphs preserving PI index upon edge removal, JOURNAL OF MATHEMATICAL CHEMISTRY, vol. 59, br. 7, str. 1603-1609 (Article) 

Stevanovic Dragan P,Indulal Gopalapillai (2009) The distance spectrum and energy of the compositions of regular graphs, APPLIED MATHEMATICS LETTERS, vol. 22, br. 7, str. 1136-1140 (Article) 

Indulal Gopalapillai,Gutman Ivan,Vijayakumar Ambat (2008) On distance energy of graphs, MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY, vol. 60, br. 2, str. 461-472 (Article) 

Indulal Gopalapillai,Gutman Ivan (2008) On the distance spectra of some graphs, MATHEMATICAL COMMUNICATIONS, vol. 13, br. 1, str. 123-131 (Article) 

Gutman Ivan,Indulal Gopalapillai,Todeschini Roberto (2008) Generalizing the McClelland bounds for total mu-electron energy, ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES, vol. 63, br. 5-6, str. 280-282 (Article)