Optical counterpart positions of extragalactic radio sources and connecting optical and radio reference framesZ. Aslan, R. Gumerov, W. Jin, I. Khamitov, N. Maigurova, G. Pinigin, Z. Tang and S. WangA&A, 510 (2010) A10DOI: https://doi.org/10.1051/0004-6361/200913162
