The mass-metallicity relation of high-z type-2 active galactic nucleiK. Matsuoka, T. Nagao, A. Marconi, R. Maiolino, F. Mannucci, G. Cresci, K. Terao and H. IkedaA&A, 616 (2018) L4DOI: https://doi.org/10.1051/0004-6361/201833418