@article{Frey:2007r6, author = "Frey, Sandor and Veres, Peter and Vida, Krisztian", title = "{Comparing the SDSS and VLBI quasar and galaxy positions }", doi = "10.22323/1.036.0072", journal = "PoS", year = 2007, volume = "8thEVN", pages = "072" }