Liquid-liquid equilibria for ternary systems of (ethylene glycol + toluene + heptane) at temperatures (303.15, 308.15, and 313.15)K and atmospheric pressure: Experimental results and correlation with UNIQUAC and NRTL models Haghnazarloo, H.; Lotfollahi, M.N.; Mahmoudi, J.; Asl, A.H.; The Journal of Chemical Thermodynamics 2013, 60, 126-131