Apparent molar volumes and apparent molar heat capacities of aqueous urea, 1,1-dimethylurea, and N,N′-dimethylurea at temperatures from (278.15 to 348.15)K and at the pressure 0.35 MPa Brown, B.; Gould, M.; Ziemer, S.; Niederhauser, T.; Woolley, E.; The Journal of Chemical Thermodynamics 2006, 38, 1025-1035