Glass-coated beryllium mirrors for the LHCb RICH1 detector by Barber, G, Brook, N, Cameron, W, D'Ambrosio, C, Frei, C, Harnew, N, Head, R, Khimitch, Y, Khmelnikov, V, Loveridge, P, Metlica, F, Obraztsov, V, Piedigrossi, D, Sizenev, V, Szczypka, P, Ullaland, O, Vygosky, E, Websdale, D