Celestial frame tie from simulations using phase referencing to GNSS satellites L. Liu, R. Heinkelmann, T. Liu, J. Liu, M. Sun, B. Zhang, Y. Ma, J. Li, Z. Lv, H. Schuh and G. Xu A&A, 671 (2023) A6 Published online: 27 February 2023 DOI: 10.1051/0004-6361/202243165