We present the results from the spectroscopic identification of the ELAIS sources in the southern fields S1 and S2. Two main extragalactic classes have been found: z<0.5 star-forming galaxies (~75%), and AGN (~25%). ~20% are dust enshrouded starburst galaxies . All the galaxies appear more dust extincted in the optical than in nearby normal galaxies. The evolution of galaxies is fitted by a strong evolution for only a fraction of the whole population. AGN1 evolves according to a pure luminosity evolution.
LA FRANCA, F., Gruppioni, C., Matute, I., Pozzi, F., Consortium, E. (2004). The Nature and Evolution of the MIR Galaxies, 301, 181.