Dzhumadildaev A.S. Hadamard invertible matrices, n-scalar products, and determinants // Mathematical Notes. – 2005. – V. 77, No.3. – P. 440-443.
Dzhumadildaev A.S. Hadamard invertible matrices, n-scalar products, and determinants // Mathematical Notes. — 2005. — V. 77, No.3. — P. 440—443.