Berkeley 33

Number of stars per data source

	Reference  594 :    5 stars

References

 594
Carraro G., Geisler D., Villanova S., Frinchaboy P.M., Majewski S.R.
(2007) Astron. Astrophys. 476, 217
Old open clusters in the outer Galactic disk
2007A&A...476..217C