Pismis 4

Number of stars per data source

	Reference  454 :    1 star
	Reference  459 :   16 stars
	Reference  515 :    3 stars

454: Grenier S.; (1974) Astron. Astrophys. Suppl. 16, 269; Photoelectric photometry of late type stars in the direction opposed to galactic rotation; 1974A&AS...16..269G
459: Moffat A.F.J., Vogt N.; (1975) Astron. Astrophys. Suppl. 20, 85; Southern open star cluster. IV. UBV Hbeta photometry of 26 clusters from Monocerotis to Vela; 1975A&AS...20...85M
515: Claria J.J., Lapasset E., Minniti D.; (1989) Astron. Astrophys. Suppl. 78, 363; Photometric metal abundances of high-luminosity red stars in young and intermediate-age open clusters; 1989A&AS...78..363C