# 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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