LÂN, Lê Thành. Hexagrams by the mathematical graph of congruence. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 19, n. 2, p. 110–116, 2012. DOI: 10.15625/1813-9663/19/2/1502. Disponível em: https://jcc.vast.vn/jcc/article/view/1502. Acesso em: 4 nov. 2025.