Elsevier, Discrete Mathematics, 16(306), p. 1871-1880, 2006
DOI: 10.1016/j.disc.2006.03.068
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The paper studies and classifies linear transformations that connect Hamming distances of codes. The transformations include irreducible linear transformations and their concatenations. The effect on the Hamming weights of codewords is investigated. In addition, the authors apply the irreducible transformations to obtain many optimal codes. A class of binary additive quantum codes of distance at most 3 is constructed.