T. Bouhennache et J. Sahbani, Conjugate operators from dispersion curves for perturbations of fibered systems in cylinders, COMM PART D, 26(7-8), 2001, pp. 1091-1115
We study the spectral properties of elliptic systems on perturbed fibered c
ylinders. This general framework covers the acoustic and elastic cylinders.
Although the electromagnetic case does not exactly fit into this framework
, we prove similar results for it. Our approach is based on constructing an
appropriate conjugate operator using general properties of the dispersion
curves.