Study of proper circulant weighing matrices with weight 9

@article{Huey2008StudyOP,
  title={Study of proper circulant weighing matrices with weight 9},
  author={Ang Miin Huey and K. Arasu and S. L. Ma and Y. Strassler},
  journal={Discret. Math.},
  year={2008},
  volume={308},
  pages={2802-2809}
}
We provide the first theoretical proof of the spectrum of orders n for which circulant weighing matrices with weight 9 exist. This spectrum consists of those positive integers n, which are multiples of 13 or 24. We actually characterize the ''minimal'' examples which exist for orders 13, 26, or 24. 

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