Observation of channeling for 6500 GeV/c protons in the crystal assisted collimation setup for LHC - Scandale, W; Arduini, G; Butcher, M; Cerutti, F; Garattini, M; Gilardoni, S; Lechner, A; Losito, R; Masi, A; Mirarchi, D; Montesano, S; Redaelli, S; et al. (Physics Letters B, 2016)