Density, Speed of Sound, and Refractive Index of 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate with Acetone, Methyl Acetate, and Ethyl Acetate at Temperatures from (278.15 to 328.15) K Vercher, E.; Llopis, F.J.; González-Alfaro, M.V.; Martínez-Andreu, A.; Journal of Chemical & Engineering Data 2010, 55, 1377-1388