Abstract
In this paper, we consider a general construction of doubly-even self-dual codes. From three symmetric 2-(31, 10, 3) designs, we construct at least 3228 inequivalent extremal doubly-even [64, 32, 12] codes. These codes are distinguished by their K-matrices.
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Harada, M., Kimura, H. New extremal doubly-even [64, 32, 12] codes. Des Codes Crypt 6, 91–96 (1995). https://doi.org/10.1007/BF01398007
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DOI: https://doi.org/10.1007/BF01398007