@article{article0f63ff03,
title   = {Astrometry of International Celestial Reference Frame sources using the second US Naval Observatory CCD astrograph catalog},
author = {Assafin, M and Monken Gomes, P. T and Silva Neto, D. N and Andrei, A. H and Martins, R. Vieira and Camargo, J. I. B and Teixeira, Ramachrisna and Benevides-Soares, Paulo},
year = {2005},
doi = {10.1086/429937},
journal   = {Astronomical Journal}
}