Marla G. answered 10/18/20
Effective Math Tutor Specializing in Statistics and Study Skills.
Hi Alaa,
When I did a search on the internet, I found the an article titles"Order-preserving Estimators and an Inequality on the Integration of Zonal Polynomial" in this journal: Communications in Statistics - Theory and Methods Volume 34, 2005 - Issue 7. Additionally, here's the Keywords: Entropy loss function, Matrix variate distribution, Orthogally invariant estimator.
I hope that's helpful to you.