@inproceedings{Hallahan:2009jM, author = "Hallahan, Redmond and Gabuzda, Denise", title = "{Variability on Decaparsec scales of a number of BL Lac objects }", doi = "10.22323/1.063.0040", booktitle = "Proceedings of Workshop on Blazar Variability across the Electromagnetic Spectrum {\textemdash} PoS(BLAZARS2008)", year = 2009, volume = "063", pages = "040" }