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We describe in detail a previously published measurement of CP violationinduced by B0-anti B0 oscillations, based on an integrated luminosity of 425.7fb-1 collected by the BABAR experiment at the PEPII collider. We apply a noveltechnique to a sample of about 6 million B0bar -> D*+ l- nubar decays selectedwith partial reconstruction of the D*+ meson. The charged lepton identifies theflavor of one B meson at its decay time, the flavor of the other B isdetermined by kaon tagging. We determine a CP violating asymmetry ACP = (0.0006+- 0.0017 + 0.0038 - 0.0032). This measurement is consistent and competitivewith those obtained at the B factories with dilepton events.

Search for CP violation In B0-B0bar mixing using partial reconstruction of B0bar -> D*+Xl-nubar and kaon tagging