@article{samplingandmultilevelcoarseningalgorithm,
  title = {Sampling and multilevel coarsening algorithms for fast matrix approximations},
  author = {Shashanka Ubaru and Yousef Saad},
  year = {2017},
  eprint = {1711.00439},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1711.00439v2},
}