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Ibrogimov, Orif and Langer, Heinz and Langer, Matthias and Tretter, Christiane (2013) Essential spectrum of systems of singular differential equations. Acta Scientiarum Mathematicarum, 79 (3-4). pp. 423-465. ISSN 0001-6969
Langer, Matthias and Woracek, H. (2011) A function space model for canonical systems. Acta Scientiarum Mathematicarum, 77 (1-2). pp. 101-165.
Dombi, Erzsebet (2003) Almost factorisable straight locally inverse semigroups. Acta Scientiarum Mathematicarum, 69 (3). pp. 569-589. ISSN 0001-6969