References

[1] J. E. Hopcroft, R. Motwani, and J. D. Ullman, Introduction to Automata Theory, Languages, and Computation, 3rd ed. Boston, MA, USA: Pearson, 2006. Available: https://courses.grainger.illinois.edu/cs374/fa2017/extra_notes/01_nfa_to_reg.pdf

[2] J. E. Hopcroft, R. Motwani, and J. D. Ullman, Introduction to Automata Theory, Languages, and Computation, 3rd ed. Boston, MA, USA: Pearson, 2006. Available: https://courses.cs.washington.edu/courses/cse311/14sp/kleene.pdf