Ultrasonic and Volumetric Properties of 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate Ionic Liquid with 2-Propanol or Tetrahydrofuran at Several Temperatures Vercher, E.; Orchillés, A.V.; Llopis, F.J.; González-Alfaro, V.; Martínez-Andreu, A.; Journal of Chemical & Engineering Data 2011, 56, 4633-4642