  From data collected around the Z resonance by the OPAL detector at LEP, a
sample of Bs decays was obtained using Ds^-l^+ combinations, where the Ds^- was
fully reconstructed in the phi pi-, K*0K- and Ks0K- decay channels or partially
reconstructed in the phi l- nu (X) decay channel. These events were used to
study Bs oscillation. The flavor (b or bbar) at decay was determined from the
lepton charge while the flavor at production was determined from a combination
of techniques. The expected sensitivity of the experiment is 4.1 ps-1. The
experiment was not able to resolve the oscillatory behavior, and we deduced
that the Bs oscillation frequency Delta m_s > 1.0 ps-1 at the 95% confidence
level.
