@article{DMGT_2006_26_1_a4,
     author = {Wang, Yi and Fan, Yi-Zheng},
     title = {Spectral integral variation of trees},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {49--58},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2006_26_1_a4/}
}