[1]
Hân, N. Đình, Vinh, H.N., Huy, P.T. and Vân, Đỗ L. 2012. An algorithm for testing whether a regular language is a code.
Journal of Computer Science and Cybernetics
. 27, 1 (Apr. 2012), 1–8. DOI:https://doi.org/10.15625/1813-9663/27/1/457.