T. V. ANOOP, K. ASHOK KUMAR:
On reverse Faber-Krahn inequalities
J. Math. Anal. Appl. Vol. 485, N. 1, p. 20, 2020

T. V. ANOOP, K. ASHOK KUMAR, S. Kesavan:
A shape variation result via the geometry of eigenfunctions
Journal of Differential Equations Vol. 298, p. 430-462, 2021

T. V. ANOOP, K. ASHOK KUMAR:
Domain variations of the first eigenvalue via a strict Faber-Krahn type inequality
Advances in Differential Equations Vol. 28, N. 7-8, p. 537-568, 2023

K. ASHOK KUMAR, N. Biswas:
Strict Faber-Krahn type inequality for the mixed local-nonlocal operator  under polarization
(preprint) 2023

K. ASHOK KUMAR, N. Biswas:
Strict monotonicity of the first $q$-eigenvalue of the fractional  $p$-Laplace operator over annuli
Journal of Geometric Analysis Vol. 34, N. 96, p. 21, 2024