U. Vijayakumar

Roots of completely positive maps

N. Mallick, B. Bhat, R. Hillier, 2018, Linear Algebra and its Applications.

On the structure and the joint spectrum of a pair of commuting isometries

Shubham Rastogi, Tirthankar Bhattacharyya, U VijayaKumar, 2021, 2105.02134.