%0 Journal Article %A Aymen Ammar %A Fatima Zohra Boutaf %A Aref Jeribi %T Extended eigenvalues of 2 × 2 block operator matrices %J Filomat %D 2023 %P 1377 %V 37 %N 5 %U http://geodesic.mathdoc.fr/articles/10.2298/FIL2305377A/ %R 10.2298/FIL2305377A %G en %F 10_2298_FIL2305377A