@inproceedings{Schaefer:2021Up, author = "Schaefer, Wolfgang", title = "{Dielectron production: QGP versus photon -- photon mechanism}", doi = "10.22323/1.390.0566", booktitle = "Proceedings of 40th International Conference on High Energy physics {\textemdash} PoS(ICHEP2020)", year = 2021, volume = "390", pages = "566" }