7. Conclusion

As the subject of this dossier is so vast, it is impossible to give a complete list of references on the subject here. However, we recommend [9][22][35] as a starting point. Readers wishing to learn more about recent developments in the subject can consult the articles [1][3][33] and the references listed in the respective bibliographies. For a more in-depth look at the aspects of functional analysis used in this dossier, we refer to