S
[Shi19] Yaroslav Shitov. An Improvement to a Recent Upper Bound for Synchronizing Words of Finite Automata. Journal of Automata, Languages and Combinatorics 24(2-4):367-373. 2019. 
@article{jalc24(2-4)-Shi,
  author =              {Shitov, Yaroslav},
  title =               {An Improvement to a Recent Upper Bound for
                         Synchronizing Words of Finite Automata},
  journal =             {Journal of Automata, Languages and Combinatorics},
  volume =              {24},
  number =              {2-4},
  pages =               {367-373},
  year =                {2019},
  doi =                 {10.25596/jalc-2019-367},
}
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