The high radio frequency spectra and variability of southern flat-spectrum radio sources

We have complemented observations of the millimeter spectra (90 and 230 GHz) of a complete sample of Southern flat-spectrum active galactic nuclei. We discuss the overall shape of the radio spectrum of these sources and identify two new gigahertz-peaked spectrum sources with unusually high peak frequencies (10-20 GHz). We also discuss the variability behavior in the millimeter domain.