The Extremes in Intra-Night Blazar Variability: The S4 0954+65 Case
  We present results of optical observations of the extremely violently variable blazar S4 0954+65 on intra-night time scales. The object showed flux changes of up to 100% within a few hours. Time delays between optical bands, color changes and "rms-flux" relations are investigated and the results are discussed in terms of existing models of blazar variability. 
Rumen Bachev, Anton Strigachev, Evgeni Semkov, Rosa Victoria Mu\~noz   Dimitrova, Georgi Latev, Borislav Spassov and Blagove...
astro-ph.HE