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Some Geometry of the Cone of Nonnegative Definite Matrices and Weights of Associated X<Superscript>2</Superscript> Distribution
Kuriki, Satoshi, (2000)
"Tail probabilities of the limiting null distributions of the Anderson-Stephens statistics"
"Shrinkage to Smooth Non-Convex Cone: Principal Component Analysis as Stein Estimation",
Takemura, Akimichi, (1998)