Inequalities for eigenvalues of sums in a von Neumann algebra

Bercovici, H., & Li, W. S. (2001). Inequalities for eigenvalues of sums in a von Neumann algebra. In Recent Advances in Operator Theory and Related Topics (pp. 113–126). Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-8374-0_6