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This research was carried out (in part) under grant GP 3909 of the National Science Foundation.
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Todd-Taussky, O. Remarks on a matrix theorem arising in statistics. Monatshefte für Mathematik 70, 461–464 (1966). https://doi.org/10.1007/BF01300451
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DOI: https://doi.org/10.1007/BF01300451