AN UPPER LIMIT FOR 2-JET PRODUCTION IN DIRECT GAMMA-(1S) DECAYS - ALBRECHT,H; BINDER,U; HARDER,G; LEMBKEKOPPITZ,I; PHILIPP,A; SCHMIDTPARZEFALL,W; SCHRODER,H; SCHULZ,HD; WURTH,R; DONKER,JP; DRESCHER,A; MATTHIESEN,U; et al. (ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1986)