The X-ray properties of $z>6$ quasars: no evident evolution of accretion physics in the first Gyr of the Universe
Preprint published in 2019 by
Fabio Vito,
William Nielsen Brandt,
Franz Erik Bauer,
Francesco Calura,
Roberto Gilli,
Bin Luo,
Ohad Shemmer,
Cristian Vignali,
Gianni Zamorani,
Marcella Brusa,
Francesca Civano,
Andrea Comastri 
,
Riccardo Nanni
,
Riccardo Nanni
