IEEE Transactions on Information Theory, 55 (2009) 952-954.
We use the geometric description to determine the best parameters of quaternary additive codes of small length. Only one open question remains for length ≤ 13. Among our results are the non-existence of [12,7,5]-codes and [12,4.5,7]-codes as well as the existence of a [13,7.5,5]-code.
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