Long-term optical, UV, and X-ray continuum variations in the changing-look AGN HE 1136-2304 M. Zetzl, W. Kollatschny, M. W. Ochmann, D. Grupe, M. Haas, M. Ramolla, D. Chelouche, S. Kaspi and N. Schartel A&A, 618 (2018) A83 Published online: 16 October 2018 DOI: 10.1051/0004-6361/201732506