References
- Annals of Mathematical Statistics v.41 Establishing the positive definiteness of the sample covariance matrix Dykstra,R.L. https://doi.org/10.1214/aoms/1177696719
- Aspects of Multivariate Statistical Theory Muirhead,R.J.
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Multivariate Analysis VI
On estimating the latent roots of
$\Sigma_{1}$ $\Sigma_{2}^{-1}$ Muirhead,R.J.;Verathaworn,T.;P.R.Krishnaiah(ed.) - Annals of Statistics v.1 Distinctness of the eigenvalues of a quadratic form in a multivariate sample Okamoto,M. https://doi.org/10.1214/aos/1176342472