Relative Permittivity of Dimethylsulfoxide and N,N-Dimethylformamide at Temperatures from (278 to 328) K and Pressures from (0.1 to 5) MPa Hunger, J.; Buchner, R.; Kandil, M.E.; May, E.F.; Marsh, K.N.; Hefter, G.; Journal of Chemical & Engineering Data 2010, 55, 2055-2065