R
[Rys83] Igor K. Rystsov. Polynomial-complete problems in automata theory. Information Processing Letters 16(1):147-151. Elsevier, April 1983. 
@article{ipl16(3)-Rys,
  author =              {Rystsov, Igor K.},
  title =               {Polynomial-complete problems in automata theory},
  publisher =           {Elsevier},
  journal =             {Information Processing Letters},
  volume =              {16},
  number =              {1},
  pages =               {147-151},
  year =                {1983},
  month =               apr,
  doi =                 {10.1016/0020-0190(83)90067-4},
}
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