D-MESON PRODUCTION FROM 400 GEV/C P-P INTERACTIONS EVIDENCE FOR LEADING DI-QUARKS - Aguilarbenitez, M; Allison, W; Bailly, J; Banerjee, S; Bartl, W; Begalli, M; Beilliere, P; Bizzarri, R; Briand, H; Canale, V; Caso, C; Castelli, E; et al. (1988)