VARIATION OF NITROGEN ABUNDANCE AMONG POPULATION II OBJECTS

[21] EVIDENCE FOR COMPOSITION GRADIENTS ACROSS DISKS OF SPIRAL GALAXIES [J]. ASTROPHYSICAL JOURNAL, 1971, 168 (03) : 327 - &

[22] COLOR CHANGES AND ABSORPTION-LINE VARIATIONS OVER INNER DISK OF M31 AND CENTRAL REGIONS OF M32 AND NGC 4472 [J]. ASTROPHYSICAL JOURNAL, 1971, 164 (01) : 11 - &

[23] STROM SE, 1971, ASTRON ASTROPHYS, V14, P111

[24] COMPOSITION OF SUBDWARF GROOMBRIDGE 1830 [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1972, 156 (03) : 349 - &

[25] UBV PHOTOMETRY OF GLOBULAR CLUSTERS [J]. ASTRONOMICAL JOURNAL, 1967, 72 (01) : 70 - +

[26] ON HELIUM ABUNDANCE IN PROTO-GALAXY [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1967, 79 (470) : 460 - +

[21] EVIDENCE FOR COMPOSITION GRADIENTS ACROSS DISKS OF SPIRAL GALAXIES [J]. ASTROPHYSICAL JOURNAL, 1971, 168 (03) : 327 - &

[22] COLOR CHANGES AND ABSORPTION-LINE VARIATIONS OVER INNER DISK OF M31 AND CENTRAL REGIONS OF M32 AND NGC 4472 [J]. ASTROPHYSICAL JOURNAL, 1971, 164 (01) : 11 - &

[23] STROM SE, 1971, ASTRON ASTROPHYS, V14, P111

[24] COMPOSITION OF SUBDWARF GROOMBRIDGE 1830 [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1972, 156 (03) : 349 - &

[25] UBV PHOTOMETRY OF GLOBULAR CLUSTERS [J]. ASTRONOMICAL JOURNAL, 1967, 72 (01) : 70 - +

[26] ON HELIUM ABUNDANCE IN PROTO-GALAXY [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1967, 79 (470) : 460 - +