@inproceedings{Becchetti:2016En, author = "Becchetti, Matteo", title = "{Ultra-Luminous X-ray Population: A Review}", doi = "10.22323/1.246.0030", booktitle = "Proceedings of XI Multifrequency Behaviour of High Energy Cosmic Sources Workshop {\textemdash} PoS(MULTIF15)", year = 2016, volume = "246", pages = "030" }