1. Perryman, M. A. C. et al. The HIPPARCOS Catalogue. Astron. Astrophys. 323, L49–L52 (1997)
2. Mermilliod, J.-C., Turon, C., Robichon, N., Arenou, F. & Lebreton, Y. in ESA SP-402: Hipparcos—Venice'97 (eds Perryman, M. A. C. & Bernacca, P. L.) 643–650 (European Space Agency, Paris, 1997)
3. van Leeuwen, F. & Hansen Ruiz, C. S. in ESA SP-402: Hipparcos—Venice'97 (eds Perryman, M. A. C. & Bernacca, P. L.) 689–692 (European Space Agency, Paris, 1997)
4. Meynet, G., Mermilliod, J.-C. & Maeder, A. A New dating of galactic open clusters. Astron. Astrophys. Suppl. Ser. 98, 477–504 (1993)
5. Pinsonneault, M. H., Stauffer, J., Soderblom, D. R., King, J. R. & Hanson, R. B. The problem of HIPPARCOS distances to open clusters. I. Constraints from multicolor main-sequence fitting. Astrophys. J. 504, 170–191 (1998)