Tonchev VD. The existence of optimal quaternary $[28,20,6]$ and quantum $[[28,12,6]]$ codes. J. Algebra Comb. Discrete Struct. Appl. [Internet]. 2014 Sep. 15 [cited 2026 Oct. 20];1(1):13-7. Available from: https://www.jacodesmath.com/index.php/jacodesmath/article/view/3