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- [23] HIGH HELIUM ABUNDANCES IN 2 PLANETARY-NEBULAE ASTROPHYSICAL JOURNAL, 1974, 188 (01): : L15 - L17
- [25] ON THE EVOLUTION OF THOSE NUCLEI OF PLANETARY-NEBULAE THAT EXPERIENCE A FINAL HELIUM SHELL FLASH ASTROPHYSICAL JOURNAL, 1983, 264 (02): : 605 - 612