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Journals and Conferences
We show that a family of cyclic Hadamard designs deened from regular ovals is a sub-family of a class of diierence set designs due to Gordon, Mills and Welch GMW]. Using a result of Scholtz and Welch SW] on the linear span of GMW sequences, we give a short proof of a conjecture of Assmus and Key on the 2-rank of this family of designs.