Sturm-Liouville Operators with Singularities and Generalized Nevanlinna Functions

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An Operator Theoretic Interpretation of the Generalized Titchmarsh-Weyl Coefficient for a Singular Sturm-Liouville Problem (2011, methodology): “For the differential expression under consideration it has been introduced in [15] and further investigated in [16], see also [17].”
Boundary Value Problems, Weyl Functions, and Differential Operators (2020, background): “For singular perturbations associated with Sturm–Liouville operators, see for instance [331] and the later papers [9, 28, 29, 124, 171, 182, 282, 315, 316, 479, 480, 481, 482, 507, 531, 532, 549, 550]; for δ-point interactions we refer to [8, 293].”