Determination of proper motions and membership of the open star cluster NGC 2548 Z. Y. Wu, K. P. Tian, L. Balaguer-Núñez, C. Jordi, J. L. Zhao and J. Guibert A&A, 381 2 (2002) 464-471 Published online: 15 January 2002 DOI: 10.1051/0004-6361:20011474