Quasi-periodic $\gamma$-ray modulations in the blazars PKS 2155-83 and PKS 2255-282

M. A. Hashad, Amr A. El-Zant, Y. Abdou +1

While there has been an increase in interest in the possibility of quasi-periodic oscillations (QPOs) in blazars, the search has hitherto been restricted to sources with well-sampl…