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References to 'Hadamard matrix'
1. circulation and vorticity by perucho
2. Hadamard conjecture by Mathprof
3. Jacques Hadamard by PrimeFan
4. matrices of special form by matte
5. prime number theorem by bbukh
6. proof that Hadamard matrix has order 1 or 2 or 4n by Mathprof
7. skew Hadamard matrix by Mathprof