Modeling the spectral energy distribution of ULIRGs - I. The radio spectra M. S. Clemens, O. Vega, A. Bressan, G. L. Granato, L. Silva and P. Panuzzo A&A, 477 1 (2008) 95-104 Published online: 26 October 2007 DOI: 10.1051/0004-6361:20077224