The Australia Telescope Large Area Survey: 2.3 GHz observations of ELAIS-S1 and CDF-S - Spectral index properties of the faint radio skyP.-C. Zinn, E. Middelberg, R. P. Norris, C. A. Hales, M. Y. Mao and K. E. RandallA&A, 544 (2012) A38DOI: https://doi.org/10.1051/0004-6361/201219349