Berkeley 33

Number of stars per data source

	Reference   67 : 1856 stars
	Reference  389 :  163 stars
	Reference  436 :  382 stars

References

 67
Mazur B., Kaluzny J., Krzeminski W.
(1993) Monthly Notices Roy. Astron. Soc. 265, 405
Photometric study of the intermediate-age open cluster Be 33
1993MNRAS.265..405M
 389
Hasegawa T., Malasan H.L., Kawakita H., Obayashi H., Kurabayashi T., Nakai T., Hyakkai M., Arimoto N.
(2004) Publ. Astron. Soc. Japan 56, 295
New photometric data of old open clusters in the anti-galactic center region
2004PASJ...56..295H
 436
Carraro G., Geisler D., Baume G., Vazquez R., Moitinho A.
(2005) Mon. Not. R. Astron. Soc. 360, 655
The intermediate-age open clusters Ruprecht 4, Ruprecht 7 and Pismis 15
2005MNRAS.360..655C