MEASUREMENT OF Z DECAYS INTO LEPTON PAIRS - ABRAMS, GS; ADOLPHSEN, CE; AVERILL, D; BALLAM, J; BARISH, BC; BARKLOW, T; BARNETT, BA; BARTELT, J; BETHKE, S; BLOCKUS, D; BONVICINI, G; BOYARSKI, A; et al. (PHYSICAL REVIEW LETTERS, 1989)