@inproceedings{Impiombato:20096B, author = "Impiombato, Domenico", title = "{VRIJHK photometry of PKS 0537-441 and PKS 2155-304 in 2006-2008}", doi = "10.22323/1.063.0043", booktitle = "Proceedings of Workshop on Blazar Variability across the Electromagnetic Spectrum {\textemdash} PoS(BLAZARS2008)", year = 2009, volume = "063", pages = "043" }