@inproceedings{Kollatschny:2016EE, author = "Kollatschny, Wolfram and Zetzl, Matthias and Schartel, Norbert", title = "{Multifrequency observations of the extreme X-ray weak quasar PG0043+039}", doi = "10.22323/1.250.0030", booktitle = "Proceedings of SALT Science Conference 2015 {\textemdash} PoS(SSC2015)", year = 2016, volume = "250", pages = "030" }