@ARTICLE{
author={Li Xuelinag,Yao Xiangmei,Zhang Jianbin,Gutman Ivan},
year={2009},
title={Maximum energy trees with two maximum degree vertices},
journal={JOURNAL OF MATHEMATICAL CHEMISTRY},
volume={45},
number={4},
pages={962-973},
document_type={Article},
} 

@ARTICLE{
author={Gutman Ivan,Li Xuelinag,Shi Yongtang T,Zhang Jianbin},
year={2008},
title={Hypoenergetic trees},
journal={MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY},
volume={60},
number={2},
pages={415-426},
document_type={Article},
}