1. Bounds on complex eigenvalues and resonances;Abramov;J. Phys. A,2001
2. On a class of non-self-adjoint quadratic matrix operator pencils arising in elasticity theory;Adamjan;J. Operator Theory,2002
3. Schrödinger operator with non-zero accumulation points of complex eigenvalues;Bögli;Comm. Math. Phys.,2017
4. Mathematical Methods in Electromagnetism;Cessenat,1996
5. On the existence and uniqueness of a solution for some frequency-dependent partial differential equations coming from the modeling of metamaterials;Cocquet;SIAM J. Math. Anal.,2012