Multiwaveband Observations of Quasars with Flat Radio Spectra and Strong   Millimeter Emission
  We present multiwaveband observations of a well selected sample of 28 quasars and two radio galaxies with flat radio spectra and strong millimeter wave emission (referred to here as FSRQ's). The observations include multifrequency VLBI measurements, X-ray observations with ROSAT and submillimeter observations with the JCMT. Particularly interesting among many findings is a correlation between the X-ray to millimeter spectral index and fraction of flux density contained in the VLBI core. This tendency toward higher X-ray fluxes from sources with stronger jet emission implies that the knots in the jet are the prominent source of X-rays. 
S. D. Bloom, A. P. Marscher, E. M. Moore, W. K. Gear, H. Terasranta,   E. Valtaoja, H. D. Aller, M. F. Aller