Observations of relativistic plasma waves excited by a 1.064 mu m and 1.053 mu m laser beat - Dyson, A; Dangor, A; DymokeBradshaw, A; AshfarRad, T; Gibbon, P; Bell, A; Danson, C; Edwards, C; Amiranoff, F; Matthieusent, G; Karttunen, S; Salomaa, R (1996)