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MR1155423 11R29 (11C20 15A33)
Katre, S. A.; Khule, Sangita A. A discriminant criterion for matrices over orders in algebraic numbers fields to be sums of squares. Proceedings of the Symposium on Algebra and Number Theory (Cochin, 1990), 31–38, Publication, 20, Centre Math. Sci., Trivandrum, 1990.
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