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Hunger, J. and Buchner, Richard and Kandil, M.E. and May, E.F. and Marsh, K.N. and Hefter, Glenn (2010) Relative Permittivity of Dimethylsulfoxide and N,N-Dimethylformamide at Temperatures from (278 to 328) K and Pressures from (0.1 to 5) MPa. Journal of Chemical & Engineering Data 55 (5), pp. 2055-2065.
Moldover, M.R. and Marsh, K.N. and Barthel, Josef and Buchner, Richard (2003) Relative permittivity and refractive index. Experimental Thermodynamics 6, pp. 433-473.