On the p-Rank of the Design Matrix of a Difference Set

@article{MacWilliams1968OnTP,
  title={On the p-Rank of the Design Matrix of a Difference Set},
  author={F. Jessie MacWilliams and H. B. Mann},
  journal={Information and Control},
  year={1968},
  volume={12},
  pages={474-488}
}