@article{53079,
      author = {Hopcroft, John E.,},
      url = {http://library.usi.edu/record/53079},
      title = {Formal languages and their relation to automata},
      publisher = {Addison-Wesley Pub. Co.},
      recid = {53079},
      pages = {vii, 242 p.},
      address = {Reading, Mass.,},
      year = {1969},
}