Proper motions of stars in the region of the Orion Nebula cluster (C 0532–054)K. P. Tian, F. van Leeuwen, J. L. Zhao and C. G. SuAstron. Astrophys. Suppl. Ser., 118 3 (1996) 503-515DOI: https://doi.org/10.1051/aas:1996216