E. ZORĘBSKI, M. ZORĘBSKI, and M. DZIDA, “Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide”, Arch. Acoust., vol. 41, no. 1, pp. 59–66, Oct. 2015, doi: 10.1515/aoa-2016-0006.