Βιβλιογραφία
- Alfred V. Aho, John E.
  Hopcroft, and Jeffrey D. Ullman.
The
  Design and Analysis of Computer Algorithms, pages 318–3335.
Addison-Wesley, 1974.
 
- Alfred V. Aho, Ravi Sethi,
  and Jeffrey D. Ullman.
Compilers, Principles, Techniques, and Tools, pages 83–157.
Addison-Wesley, 1985.