Study of $B_s$ oscillations using semileptonic decays

We report preliminary results on the search for $B_{s}$ oscillations using approximately 910 pb$^{-1}$ of data taken at the D\O\ experiment during Run IIa at the Tevatron. We search for oscillations in the time dependence of semileptonic decays of the $B_{s}$, $B_{s}\rightarrow D_{s}l X$ where the flavor of the $B_s$ at production is determined by studying inclusive properties of the event.