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Benhida Chafiq; El Wahbi Bouazza; Zerouali Elhassan: On strong cyclic behavior of the adjoint ω-hyponormal operators. In: Acta scientiarum mathematicarum, (75) 1-2. pp. 275-287. (2009)
Benhida Chafiq; Zerouali Elhassan; Zguitti Hassane: Spectral properties of upper triangular block operators. In: Acta scientiarum mathematicarum, (71) 3-4. pp. 681-690. (2005)
Benhida Chafiq: Espaces duaux et propriétés (Am,n ). In: Acta scientiarum mathematicarum, (58) 1-4. pp. 431-441. (1993)