Measurements of the leptonic branching fractions of the tau - Abreu, P; Adam, W; Adye, T; Adzic, P; Ajinenko, I; Albrecht, Z; Alderweireld, T; Alekseev, GD; Alemany, R; Allmendinger, T; Allport, PP; Almehed, S; et al. (European Physical Journal C, 1999)