First black hole mass estimation for the quadruple lensed system WGD2038-4008 A. Melo, V. Motta, N. Godoy, J. Mejia-Restrepo, R. J. Assef, E. Mediavilla, E. Falco, F. Ávila-Vera and R. Jerez A&A, 656 (2021) A108 Published online: 09 December 2021 DOI: 10.1051/0004-6361/202141869