Measurement of the relative branching fraction of upsilon(4S) to charged and neutral B-meson pairs. - Alexander, J; Baker, R; Bebek, C; Berger, B; Berkelman, K; Blanc, F; Boisvert, V; Cassel, D; Dickson, M; Drell, P; Ecklund, K; Ehrlich, R; et al. (Physical Review Letters, 2001)