1. Matrix Analysis;Bhatia,1997
2. Positive Definite Matrices;Bhatia,2007
3. Limit Distributions for Sums of Independent Random Variables;Gnedenko,1954
4. Means for matrices and comparison of their norms;Hiai;Indiana Univ. Math. J.,1999
5. Means of Hilbert Space Operators;Hiai,2003