Synthesis and physical-chemical properties of ionic liquids based on 1-n-butyl-3-methylimidazolium cation P. A.Z. Suarez, S. Einloft, J. E.L. Dullius, R. F. de Souza and J. Dupont J. Chim. Phys., 95 7 (1998) 1626-1639 DOI: 10.1051/jcp:1998103