A note on extended quadratic residue codes over GF(9) and their ternary images (Corresp.)
G.J.M. Beenker · IEEE Transactions on Information Theory · 1984
We discuss[2(p + 1), p + 1]double circulant codes which are the ternary images of the[p + 1,(p + 1)/2]extended quadratic residue codes over GF(9). Herepis a prime of the formp = 12k \pm 5. As a special result we obtain a[64, 32,18]ternary self-dual code which is the largest known code meeting the bound of Mallows and Sloane.