共 50 条
- [1] HIGH HELIUM ABUNDANCES IN 2 PLANETARY-NEBULAE ASTROPHYSICAL JOURNAL, 1974, 188 (01): : L15 - L17
- [2] ABUNDANCES OF HELIUM, NITROGEN, AND OXYGEN IN PLANETARY-NEBULAE OF MAGELLANIC CLOUDS ASTROPHYSICAL JOURNAL, 1976, 203 (02): : 352 - 360
- [9] ABUNDANCES, PLANETARY-NEBULAE, AND STELLAR EVOLUTION ASTROPHYSICAL JOURNAL, 1994, 432 (02): : 427 - 437