@ARTICLE{
author={Das KC,Xu Kexiang,Gutman Ivan},
year={2012},
title={Comparison between Kirchhoff index and the Laplacian-energy-like invariant},
journal={LINEAR ALGEBRA AND ITS APPLICATIONS},
volume={436},
number={9},
pages={3661-3671},
document_type={Article},
} 

@ARTICLE{
author={Das KC,Bhatti Faqir M,Lee Sang-Gu,Gutman Ivan},
year={2011},
title={Spectral Properties of the He Matrix of Hexagonal Systems},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={65},
number={3},
pages={753-774},
document_type={Article},
} 

@ARTICLE{
author={Das KC,Gutman Ivan},
year={2010},
title={Estimating the Wiener Index by Means of Number of Vertices, Number of Edges, and Diameter},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={64},
number={3},
pages={647-660},
document_type={Article},
} 

@ARTICLE{
author={Das KC,Gutman Ivan},
year={2010},
title={Estimating the Vertex PI Index},
journal={ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES},
volume={65},
number={3},
pages={240-244},
document_type={Article},
} 

@ARTICLE{
author={Das KC,Gutman Ivan},
year={2009},
title={Estimating the Szeged index},
journal={APPLIED MATHEMATICS LETTERS},
volume={22},
number={11},
pages={1680-1684},
document_type={Article},
} 

@ARTICLE{
author={Das KC,Gutman Ivan,Zhou Bo},
year={2009},
title={New upper bounds on Zagreb indices},
journal={JOURNAL OF MATHEMATICAL CHEMISTRY},
volume={46},
number={2},
pages={514-521},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Das KC},
year={2004},
title={The first Zagreb index 30 years after},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={},
number={50},
pages={83-92},
document_type={Article},
}