A MEASUREMENT OF B-MESON PRODUCTION AND LIFETIME USING DL- EVENTS IN Z(0) DECAYS - ABREU, P; ADAM, W; ADYE, T; AGASI, E; ALEKSEEV, GD; ALGERI, A; ALLEN, P; ALMEHED, S; ALVSVAAG, SJ; AMALDI, U; ANASSONTZIS, EG; ANDREAZZA, A; et al. (ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1993)