Models of polarized and variable radio emission in the IDV source 0917+624 by Beckert, T, Kraus, A, Krichbaum, T, Witzel, A, Zensus, J

A high-frequency and multi-epoch VLBI study of 3C 273 by Krichbaum, T, Graham, D, Witzel, A, Zensus, J, Greve, A, Grewing, M, Marscher, A, Beasley, A

Towards the Event Horizon - The Vicinity of AGN at Micro-Arcsecond Resolution by Krichbaum, T, Graham, D, Alef, W, Kraus, A, Sohn, B, Bach, U, Polatidis, A, Witzel, A, Zensus, J, Bremer, M, Greve, A, Grewing, M, Doeleman, S, Phillips, R, Rogers, A, Fagg, H, Strittmatter, P, Ziurys, L, Conway, J, Booth, R, Urpo, S