On the complexity of minimizing probabilistic and quantum automata

@article{Mateus2012OnTC,
  title={On the complexity of minimizing probabilistic and quantum automata},
  author={Paulo Mateus and Daowen Qiu and Lvzhou Li},
  journal={Inf. Comput.},
  year={2012},
  volume={218},
  pages={36-53}
}
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