Kirsch, R.
(1963),
The Application of Automata Theory to Problems in Information Retrieval, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=821720
(Accessed December 7, 2024)