by Riffkin H.L, Duffus C.M, Bridges I.C
Published in Physiologia plantarum (1995)

by Riffkin, H.L, Bringhurst, T.A, McDonald, A.M.L, Hands, E
Published in Aspects of applied biology (1990)

by Riffkin, H.L, Wilson, R, Howie, D, Muller, S.B
Published in Journal of the Institute of Brewing (1989)