@ARTICLE{
author={Liu Jiaguo,Gutman Ivan,Mu Zengchao,Zhang Yusen},
year={2012},
title={q-Wiener index of some compound trees},
journal={APPLIED MATHEMATICS AND COMPUTATION},
volume={218},
number={18},
pages={9528-9535},
document_type={Article},
} 

@ARTICLE{
author={Zhang Yusen,Gutman Ivan,Liu Jiaguo,Mu Zengchao},
year={2012},
title={q-Analog of Wiener Index},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={67},
number={2},
pages={347-356},
document_type={Article},
}