The Perturbation Classes Problem for Generalized Drazin Invertible Operators II von Ounadjela, Djalel, Benharrat, Mohammed, Messirdi, Bekkai

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Birkhoff Normal Forms for Born-Oppenheimer Operators von Nawel Latigui, Bekkai Messirdi, Kaoutar Ghomari

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Semiclassical Resonances via Meromorphy of the Resolvent and the S-Matrix von Soumia Belmouhoub, Bekkai Messirdi, Abderrahmane Senoussaoui

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Left and Right Generalized Drazin Invertibility of an Upper Triangular Operator Matrices with Application to Boundary Value Problems von Kouider Miloud Hocine, Bekkai Messirdi, Mohammed Benharrat

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Strong Metrizability for Closed Operators and the Semi-Fredholm Operators between Two Hilbert Spaces von Mohammed Benharrat, Bekkai Messirdi

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A Spectral Analysis of Linear Operator Pencils on Banach Spaces with Application to Quotient of Bounded Operators von Bekkai Messirdi, Abdellah Gherbi, Mohamed Amouch

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Quasi-Compact Perturbations of the Weyl Essential Spectrum and Application to Singular Transport Operators von Leila Mebarki, Mohammed Benharrat, Bekkai Messirdi

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Stability of Almost Closed Operators on a Hilbert Space von Messirdi, Sanaa, Djaa, Mustapha, Messirdi, Bekkai

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Left and right resolvents and new characterizations of left and right generalized Drazin invertible operators von Ounadjela, Djalal, Messirdi, Bekkai, Messirdi, Sofiane

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A class of generalized integral operators von Samir Bekkara, Bekkai Messirdi, Abderrahmane Senoussaoui

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Structure of the Spectra and Resonances of Schrödinger Operators von Bouguetaia, Tahar, Messirdi, Bekkai

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Stability of essential spectra of closed operators under T-compact equivalence and applications von Khaldi, Nassima, Messirdi, Bekkai

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NEW RESULTS ON SEMICLOSED LINEAR RELATIONS von Abdellah, Gherbi, Bekkai, Messirdi, Sanaa, Messirdi

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Left and right generalized Drazin invertible operators and local spectral theory von Benharrat, Mohammed, Hocine, Kouider Miloud, Messirdi, Bekkai

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Drazin inverse: representation, approximation, continuity and illustrations von Bendjedid, Sadli, Messirdi, Bekkai, Messirdi, Sofiane

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Quantum Birkhoff–Gustavson normal form in some completely resonant cases von Ghomari, Kaoutar, Messirdi, Bekkai

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Relationship Between the Goldberg Spectrum and the B-Fredholm Spectra von Benharrat, Mohammed, Messirdi, Bekkai

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Left and Right Generalized Drazin Invertibility of an Upper Triangular Operator Matrices with Application to Boundary Value Problems von Kouider Miloud Hocine, Bekkai Messirdi, Mohammed Benharrat

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Strong Metrizability for Closed Operators and the Semi-Fredholm Operators between Two Hilbert Spaces von Mohammed Benharrat, Bekkai Messirdi

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Generalized Kato Linear Relations von Benharrat, Mohammed, Álvarez, Teresa, Messirdi, Bekkai

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