DIRECT PHOTON PRODUCTION IN PBARP COLLISIONS AT SQUARE-ROOT-S=630 GEV - Ansari, R; Bagnaia, P; Banner, M; Battiston, R; Bernlohr, K; Booth, C; Borer, K; Borghini, M; Carboni, G; Cavasinni, V; Cenci, P; Chollet, J; et al. (1988)