Bright Lyα emitters at z 9: Constraints on the LF from HizELS - Sobral, D; Best, P; Geach, J; Smail, I; Kurk, J; Cirasuolo, M; Casali, M; Ivison, R; Coppin, K; Dalton, G (Monthly Notices of the Royal Astronomical Society: Letters, 2009)