@inproceedings{Winkler:20187m, author = "Winkler, Hartmut", title = "{Some things change, some don’t. An exploration of Seyfert galaxy luminosity changes over a generation}", doi = "10.22323/1.319.0011", booktitle = "Proceedings of 5th Annual Conference on High Energy Astrophysics in Southern Africa {\textemdash} PoS(HEASA2017)", year = 2018, volume = "319", pages = "011" }