Gabor wave front sets of ultradistributions are invariant under ε-perturbations of Christensen type and nonstationary Gabor frames.
Asensio,Matrix-Wigner global wave front sets in ultradifferentiable classes, J
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Stability of global wave front sets by perturbations of frames
Gabor wave front sets of ultradistributions are invariant under ε-perturbations of Christensen type and nonstationary Gabor frames.