@article{spectralsparsificationofrandomwalkmatrix,
  title = {Spectral Sparsification of Random-Walk Matrix Polynomials},
  author = {Dehua Cheng and Yu Cheng and Yan Liu and Richard Peng and Shang-Hua Teng},
  year = {2015},
  eprint = {1502.03496},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1502.03496v1},
}