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Gamma-ray band and multi-waveband variability of blazars with the Fermi Large Area Space Telescope

. The Fermi Gamma-ray Space Telescope, as an all-sky survey and monitoring mission, is producing daily/weekly sampled gamma-ray light curves for dozens of blazars and other high-energy sources. Highlights on MeV-GeV gamma-ray variability properties of these sources are reported together with a few remarks about some multi- waveband observing campaigns led by Fermi and targeted to known or newly discovered gamma-ray blazars.