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  Absolutely continuous spectrum preservation: A new proof for unitary operators under finite-rank multiplicative perturbations

  Pablo A. Díaz

  701–712

  2025-12-25
• 

  Estabilidad espectral y resonancias para perturbaciones de rango finito y singulares Spectral stability and resonances for finite rank and singular perturbations

  M. Angélica Astaburuaga, Víctor H. Cortés, Claudio Fernández, Rafael Del Río

  505–522

  2025-10-30
• 

  On the approximation of the δ-shell interaction for the 3-D Dirac operator

  Mahdi Zreik

  489–505

  2024-12-11