Modeling the hard TeV spectra of blazars 1ES 0229+200 and 3C 66A with an   internal absorption scenario
  We study the applicability of the idea of internal absorption of gamma-rays produced through synchrotron radiation of ultrarelativistic protons in highly magnetized blobs to 1ES 0229+200 and 3C 66A, the two TeV blazars which show unusually hard intrinsic gamma-ray spectra after being corrected for the intergalactic absorption. We show that for certain combinations of reasonable model parameters, even with quite modest energy requirements, the scenario allows a self-consistent explanation of the non-thermal emission of these objects in the keV, GeV, and TeV energy bands. 
Olga Zacharopoulou, Dmitry Khangulyan, Felix A. Aharonian, Luigi   Costamante
astro-ph.HE