Applying a known concatenation procedure to a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[30, 15, 12]</tex> quadratic residue code over GF(4) results in <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">29</tex> new binary codes. Each of these codes is larger than previous codes having the same length and minimum distance.
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James A. Wiseman (1983) studied this question.
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