@inproceedings{Costamante:2020N/, author = "Costamante, Luigi", title = "{Blazars - an updated review}", doi = "10.22323/1.362.0035", booktitle = "Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII {\textemdash} PoS(MULTIF2019)", year = 2020, volume = "362", pages = "035" }