TOAN, N. C.; LAP, D. V. On the method of state invariance. Journal of Computer Science and Cybernetics, [S. l.], v. 11, n. 2, 2016. DOI: 10.15625/1813-9663/11/2/8134. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/8134. Acesso em: 17 may. 2024.