Brazier, K.T.S., Carraminaña, A., Chadwick, P.M., Dipper, N.A., Lincoln, E.W., Mannings, V.G., McComb, T.J.L., Orford, K.J., Rayner, S.M., Turver, K.E., "Enhancement of the gamma ray signal in atmospheric Cerenkov light measurements using the University of Durham VHE gamma ray telescopes", Nuclear Physics B Proceedings Supplements, 1990