NGC 884

Number of stars per data source

	Reference    7 :    6 stars
	Reference   16 :    7 stars
	Reference   23 :   19 stars
	Reference   31 :    1 star

7: Johnson H.L.; (1965) Astrophys. J. 141, 923; Interstellar Extinction in the Galaxy; 1965ApJ...141..923J
16: Johnson H.L., Mendoza E.E.; (1966) Ann. Astrophys. 29, 525; The Law of Interstellar Extinction in Perseus; 1966AnAp...29..525J
23: Mendoza E.E.; (1967) Tonantzintla Tacubaya 4, 149; Multicolor Photometry of Stellar Aggregates; 1967BOTT....4..149M
31: Serkowski K., Gehrels T., Wisniewski W.; (1969) Astron. J. 74, 85; Wavelength Dependence of Polarization. XIII. Interstellar Extinction and Polarization Correlations; 1969AJ.....74...85S