___

• [1] Behrndt J, Hassi S, Snoo H, Wietsma R. Square-integrable solutions and Weyl functions for singular canonical systems. Mathematische Nachrichten 2001; 284: 1334-1384.
• [2] Behrndt J, Malamud M, Neidhardt H. Scattering theory for open quantum systems with finite rank coupling. Mathematical Physics, Analysis and Geometry 2007; 10: 313-358.
• [3] Derkach V, Malamud M. Generalized resolvents and the boundary value problems for Hermitian operators with gaps. Journal of Functional Analysis 1991; 95: 1-95.
• [4] Derkach V, Malamud M. The extension theory of Hermitian operators and the moment problem. Journal of Mathematical Sciences 1995; 73: 141-242.
• [5] Fischbacher C. On the theory of dissipative extensions. PhD, University of Kent School of Mathematics, Canterbury, England, 2017.
• [6] Gorbachuk VI, Gorbachuk ML. Boundary Value Problems for Operator Differential Equations. 1st ed. Dordrecht, the Netherlands: Kluwer Academic Publishers, 1991.
• [7] Hörmander L. On the theory of general partial differential operators. Acta Mathematica 1955; 94: 161-248.
• [8] Mogilevskii V. Boundary pairs and boundary conditions for general (not necessarily definite) first-order symmetric system with arbitrary deficiency indices. Mathematische Nachrichten 2012; 285: 1895-1931.
• [9] Nagy BSz, Foias C. Analyse Harmonique des Operateurs de L’ espace de Hilbert. Paris, France: Budapest Akadémiai Kiadó, 1967.
• [10] Naimark MA. Linear Differential Operators. New York, USA: Frederick Ungar Publishing Company, 1968.
• [11] Rofe-Beketov FS, Kholkin AM. Spectral analysis of differential operators. World Scientific Monograph Series in Mathematics 7; 2005.
• [12] von Neumann J. Allgemeine eigenwerttheories hermitescher funktionaloperatoren. Mathematische Annalen 1929- 1930; 102: 49-131 (article in German)