S. ter Veen,
J. E. Enriquez,
H. Falcke,
J. P. Rachen,
M. van den Akker,
P. Schellart,
A. Bonardi,
R. P. Breton,
J. W. Broderick,
S. Corbel et al. (12 more)
A&A, 621 (2019) A57
Published online: 08 January 2019
DOI: 10.1051/0004-6361/201732515
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