Thermodynamics of lattice QCD with two light quark flavours on a 16^3 x   8 lattice II
  We have extended our earlier simulations of the high temperature behaviour of lattice QCD with two light flavours of staggered quarks on a $16^3 \times 8$ lattice to lower quark mass (m_q=0.00625). The transition from hadronic matter to a quark-gluon plasma is observed at $6/g^2=5.49(2)$ corresponding to a temperature of $T_c \approx 140$MeV. We present measurements of observables which probe the nature of the quark-gluon plasma and serve to distinguish it from hadronic matter. Although the transition is quite abrupt, we have seen no indications that it is first order. 
S.Gottlieb, U.M.Heller, A.D.Kennedy, S.Kim, J.B.Kogut, C.Liu,   R.L.Renken, D.K.Sinclair, R.L.Sugar, D.Toussaint and K.C.Wang