@incollection{dSW18pontryaginspaces, title={Compressed resolvents, {$Q$}-functions and {$h_0$}-resolvents in almost pontryagin spaces}, author={de Snoo, Henk and Woracek, Harald}, booktitle={Indefinite Inner Product Spaces, Schur Analysis, and Differential Equations}, pages={425--484}, year={2018}, publisher={Springer}, doi = {10.1007/978-3-319-68849-7_18}, biburl = {http://samuel-mohr.de/files/bib/wien.bib}, abstract = {The interest of this paper lies in the selfadjoint extensions of a symmetric relation in an almost Pontryagin space. More in particular, in their compressed resolvents, {$Q$}-functions and {$h_0$}-resolvents. We give a systematic approach to each of this three topics, and show an intimate connection between the last two.}, note = {During an Erasmus exchange stay at Vienna University of Technology for six months in 2015, I worked on a joint project titled ``Operator theory in indefinite inner product space'' with the ``Research Group for Functional Analysis'' of Professor Harald Woracek; results can be found here. } } @incollection{dSW18pontryaginspaces_withoutnote, title={Compressed resolvents, {$Q$}-functions and {$h_0$}-resolvents in almost pontryagin spaces}, author={de Snoo, Henk and Woracek, Harald}, booktitle={Indefinite Inner Product Spaces, Schur Analysis, and Differential Equations}, pages={425--484}, year={2018}, publisher={Springer}, doi = {10.1007/978-3-319-68849-7_18}, biburl = {http://samuel-mohr.de/files/bib/wien.bib}, abstract = {The interest of this paper lies in the selfadjoint extensions of a symmetric relation in an almost Pontryagin space. More in particular, in their compressed resolvents, {$Q$}-functions and {$h_0$}-resolvents. We give a systematic approach to each of this three topics, and show an intimate connection between the last two.}, }