Evidence for a milliparsec-separation supermassive binary black hole with quasar microlensing M. Millon, C. Dalang, C. Lemon, D. Sluse, E. Paic, J. H. H. Chan and F. Courbin A&A, 668 (2022) A77 Published online: 06 December 2022 DOI: 10.1051/0004-6361/202244440