Langer, M., & Woracek, H. (2023). Direct and Inverse Spectral Theorems for a Class of Canonical Systems with Two Singular Endpoints. In I. Binder, D. Kinzebulatov, & J. Mashreghi (Eds.), Function Spaces, Theory and Applications (Vol. 87, pp. 105–205). Springer. https://doi.org/10.1007/978-3-031-39270-2_5