TONCHEV, Vladimir D. The existence of optimal quaternary $[28,20,6]$ and quantum $[[28,12,6]]$ codes. Journal of Algebra Combinatorics Discrete Structures and Applications, [S. l.], v. 1, n. 1, p. 13–17, 2014. DOI: 10.13069/jacodesmath.25090. Disponível em: https://www.jacodesmath.com/index.php/jacodesmath/article/view/3. Acesso em: 19 aug. 2026.