Speeds of sound in (0.95 N2 + 0.05 CO and 0.9 N2 + 0.1 CO) gas mixtures at T = (273 and 325)K and pressure up to 10 MPa Pérez-Sanz, F.J.; Segovia, J.J.; Martín, M.C.; del Campo, D.; Villamañán, M.A.; The Journal of Chemical Thermodynamics 2014, 79, 224-229