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		| Paper: | 
		The Micro-Arcsecond Scintillation-Induced Variability (MASIV) VLA Survey | 
	 
	
		| Volume: | 
		290, Active Galactic Nuclei: from Central Engine to Host Galaxy | 
	 
	
		| Page: | 
		347 | 
	 
	
		| Authors: | 
		Lovell, J. E. J.; Jauncey, D. L.; Tzioumis, A. K.; Bignall, H. E.; Kedziora-Chudczer, L.; Macquart, J.-P.; Rickett, B. J. | 
	 
	
	
		| Abstract: | 
		We are undertaking an Intra-Day Variability (IDV) Survey of 700 flat-spectrum AGN with the VLA at 5 GHz. Current evidence supports interstellar scintillation (ISS) as the mechanism causing IDV at cm wavelengths. While the Survey is still underway, the first results show at least 15% of the sources exhibit IDV, and hence possess microarcsecond scale structure. There is also a strong flux density dependence on the fraction of IDV sources, and some indication that EGRET sources are more likely to exhibit IDV than non-EGRET sources. | 
	 
	
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