Bounds for the variation of the roots of a polynomial and the eigenvalues of a matrix
In: Linear algebra and its applications, Jg. 142, S. 195-2091990
The Hoffman-Wielandt inequality in infinite dimensions
In: Proceedings of the Indian Academy of Sciences, Mathematical Sciences, Jg. 104 H. 3, S. 483-4941994Symmetries and variation of spectra
In: Canadian journal of mathematics, Jg. 44 H. 6, S. 1155-11661992