Thermodynamics of amide + amine mixtures. 4. Relative permittivities of N,N-dimethylacetamide + N-propylpropan-1-amine, + N-butylbutan-1-amine, + butan-1-amine, or + hexan-1-amine systems and of N,N-dimethylformamide + aniline mixture at several temperatures. Characterization of amine + amide systems using ERAS Hevia, F.; González, J.A.; Cobos, A.; García de la Fuente, I.; Sanz, L.F.; The Journal of Chemical Thermodynamics 2018, 118, 175-187