@article{bw-wibbt-07,
author = {Sergey Bereg and Hao Wang},
title = {Wiener Indices of Balanced Binary Trees},
journal = {Discrete Applied Mathematics},
year = {2007},
volume = {155},
number = {4},
pages = {457--467},
url = {http://dx.doi.org/10.1016/j.dam.2006.08.003}
}