Experimental search for subthreshold coherent pion production - Erazmus, B; Guet, C; Gillibert, A; Mitting, W; Schutz, Y; Villari, A C C; Kuhn, W; Riess, S; Nifenecker, H; Pinston, J A; Grosse, E; Holzmann, R (Nouvelles du Ganil, 1989)