Primordial environment of supermassive black holes - II. Deep Y- and J-band images around the z ~ 6.3 quasar SDSS J1030+0524B. Balmaverde, R. Gilli, M. Mignoli, M. Bolzonella, M. Brusa, N. Cappelluti, A. Comastri, E. Sani, E. Vanzella, C. Vignali, F. Vito and G. ZamoraniA&A, 606 (2017) A23DOI: https://doi.org/10.1051/0004-6361/201730683
