@ARTICLE{
author={Rucker G,Rucker C,Gutman Ivan},
year={2002},
title={On kites, comets, and stars. Sums of eigenvector coefficients in (molecular) graphs},
journal={ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES},
volume={57},
number={3-4},
pages={143-153},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Rucker C,Rucker G},
year={2001},
title={On walks in molecular graphs},
journal={JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES},
volume={41},
number={3},
pages={739-745},
document_type={Article},
}