Influence of Temperature and Composition upon Density, Viscosity, Speed of Sound, and Refractive Index of Aqueous Solutions of 1-Ethyl-2-pyrrolidinone Blanco, A.; García-Abuín, A.; Gómez-Díaz, D.; Navaza, J.M.; Vidal-Tato, I.; Journal of Chemical & Engineering Data 2010, 55, 962-965