Abstract
An [18,9,8] extremal self-dual code over GF(4) and related [17,4,12], [17,8,8], [17,9,7], [17,13,4] codes are investigated. Simple coordinates are given for these codes, and their minimal weight codewords and automorphism groups are determined. The groups are all isomorphic to 3 x (PSL 2(16).4).
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