- Siaka Koné, Manfred Móller, “Mixed Order Systems of Ordinary Linear Differential Equations”, Rocky Mountain J. Math., 36, № 3, 2006
- Aref Jeribi, Spectral Theory and Applications of Linear Operators and Block Operator Matrices, 2015, 121
- Aymen AMMAR, Bilel BOUKETTAYA, Aref JERIBI, “Stability of the S-left and S-right essential spectra of a linear operator”, Acta Mathematica Scientia, 34, № 6, 2014, 1922
- Aref Jeribi, Spectral Theory and Applications of Linear Operators and Block Operator Matrices, 2015, 173
- Heinz Langer, Christiane Tretter, “Spectral properties of the Orr-Sommerfeld problem”, Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 127, № 6, 1997, 1245
- Aref Jeribi, Spectral Theory and Applications of Linear Operators and Block Operator Matrices, 2015, 283
- Malcolm Brown, Tomáš Dohnal, Michael Plum, Ian Wood, “Spectrum of the Maxwell Equations for a Flat Interface Between Homogeneous Dispersive Media”, Commun. Math. Phys., 406, № 1, 2025, 3