@article{Vercellone:2024L6, author = "Vercellone, Stefano and Romano, Patrizia and Baitieri, Sara", title = "{Gamma-ray narrow-line Seyfert galaxies: first long-term optical, UV, and X-ray monitoring}", doi = "10.22323/1.461.0050", journal = "PoS", year = 2024, volume = "HEPROVIII", pages = "050" }