Some Extremal Self-Dual Codes with an Automorphism of Order 7

@article{Dontcheva2003SomeES,
  title={Some Extremal Self-Dual Codes with an Automorphism of Order 7},
  author={Radinka Dontcheva and Masaaki Harada},
  journal={Applicable Algebra in Engineering, Communication and Computing},
  year={2003},
  volume={14},
  pages={75-79}
}
In this note, some new extremal singly-even self-dual codes of lengths 60 and 64 are constructed using automorphisms of order 7. These codes have weight enumerators for which no extremal self-dual codes were previously known to exist. 

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