Determination of proper motions and membership of the open clusters NGC 1750 and NGC 1758K.-P. Tian, J.-L. Zhao, Zh.-Y. Shao and P. B. StetsonAstron. Astrophys. Suppl. Ser., 131 1 (1998) 89-98DOI: https://doi.org/10.1051/aas:1998253