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Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales: Flux and spectral variations
Context. The TeV BL Lac object PG 1553+113 is one of the primary candidates for a binary supermassive black hole system.Aims. We study the flux and spectral variability of PG 1553+113 on intra-night to long-term timescales ...