1. Ando, T., Li, C.-K., Mathias, R.: Geometric means. Linear Algebra Appl. 385, 305–334 (2004)
2. Bhatia, R.: Positive definite matrices. Princeton Series in Applied Mathematics. Princeton University Press, Princeton (2007)
3. Bhatia, R., Holbrook, J.: Riemannian geometry and matrix geometric means. Linear Algebra Appl. 413(2–3), 594–618 (2006)
4. Bini, D., Iannazzo, B.: On the numerical solution of the matrix equation $\sum_{i=1}^k \log({XA}_i^{-1})=$ 0. In: 16-th ILAS Conference, Pisa, 21–25 June 2010. www.dm.unipi.it/~ilas2010/abstracts-im4.pdf
5. Bini, D.A., Iannazzo, B.: The Matrix Means Toolbox. http://bezout.dm.unipi.it/software/mmtoolbox/ . Retrieved 7 May 2010.