Long-term optical, UV, and X-ray continuum variations in the changing-look AGN HE 1136-2304M. Zetzl, W. Kollatschny, M. W. Ochmann, D. Grupe, M. Haas, M. Ramolla, D. Chelouche, S. Kaspi and N. SchartelA&A, 618 (2018) A83DOI: https://doi.org/10.1051/0004-6361/201732506
