Marshall, A. W.; Olkin, I. (1990). "Matrix versions of the Cauchy and Kantorovich inequalities". Aequationes Mathematicae. Springer Science and Business Media LLC. 40 (1): 89–93. doi:10.1007/bf02112284. ISSN0001-9054.
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Marshall, A. W.; Olkin, I. (1990). "Matrix versions of the Cauchy and Kantorovich inequalities". Aequationes Mathematicae. Springer Science and Business Media LLC. 40 (1): 89–93. doi:10.1007/bf02112284. ISSN0001-9054.