J Abdallah, P Abreu, W Adam, P Adzic, A. Sopczak: Measurement of the forward-backward asymmetries of e(+)e(-)-> Z -> b(b)over-bar and e(+)e(-)-> Z -> c(c)over-bar using prompt leptons. The European Physical Journal C 34(2), 109-125 (2004). doi:10.1140/epjc/s2004-01708-6