A direct black-hole mass measurement in a little red dot at high redshift - Ignas Juodžbalis; Cosimo Marconcini; Francesco D’Eugenio; Roberto Maiolino; Alessandro Marconi; Hannah Übler; Jan Scholtz; Xihan Ji; Gareth C. Jones; Michele Perna; Santiago Arribas; Jake S. Bennett; et al. (Nature, 2026)