@article{adaptivelownonnegativerankapproximation,
  title = {Adaptive Low-Nonnegative-Rank Approximation for State Aggregation of Markov Chains},
  author = {Yaqi Duan and Mengdi Wang and Zaiwen Wen and Yaxiang Yuan},
  year = {2018},
  eprint = {1810.06032},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1810.06032v1},
}