Extremal self-dual codes with an automorphism of order 2
Stefka Buyuklieva, N. Boukliev · IEEE Transactions on Information Theory · 1998
A method to design binary self-dual codes with an automorphism of order two without fixed points is presented. Extremal self-dual codes with lengths 40, 42, 44, 54, 58, 68 are constructed. Many of them have weight enumerators for which extremal codes were previously not known to exist.