L. Plank, S. Shabala, J. McCallum, H. Krasna, B. Petrachenko, E. Rastorgueva-Foi, J. Lovell:
"On the estimation of a celestial reference frame in the presence of source structure";
Monthly Notices of the Royal Astronomical Society, 455 (2015), 1; 343 - 356.
http://dx.doi.org/10.1093/mnras/stv2080Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_242474.pdf