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Oscillations of B0s mesons have been studied in samples selected from about3.5 million hadronic Z decays detected by DELPHI between 1992 and 1995. Oneanalysis uses events in the exclusive decay channels: B0s -> Ds- pi+ or Ds- a1+and B0s -> anti-D0 K- pi+ or anti-D0 K- a1+, where the D decays are completelyreconstructed. In addition, B0s anti-B0s oscillations have been studied inevents with an exclusively reconstructed Ds accompanied in the same hemisphereby a high momentum hadron of opposite charge. Combining the two analyses, alimit on the mass difference between the physical B0s states has been obtained:  Delta(m_B0s) > 4.0 ps^{-1} at the 95% C.L. with a sensitivity of Delta(m_B0s)= 3.2 ps^{-1}. Using the latter sample of events, the B0s lifetime has beenmeasured and an upper limit on the decay width difference between the twophysical B0s states has been obtained:  tau(B0s) = 1.53^{+0.16}_{-0.15}(stat.) +/- {0.07}(syst.) ps  \Delta\Gamma(B0s)/\Gamma(B0s) < 0.69 at the 95% C.L.  The combination of these results with those obtained using Ds+- lepton-+sample gives:  Delta(m_B0s) > 4.9 ps^{-1} at the 95% C.L.  with a sensitivity of Delta(m_B0s) = 8.7 ps^{-1}.  tau(B0s) = 1.46 +/- 0.11 ps and \Delta\Gamma(B0s)/\Gamma(B0s) < 0.45 at the95% C.L.Comment: 42 pages, 13 figure

Study of ${\mathrm B^0_s}-\overline{\mathrm B^0_s}$ oscillations and ${\mathrm B^0_s}$ lifetimes using hadronic decays of ${\mathrm B^0_s}$ mesons