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| Cosmic abundances. (2) |
| Physics, Astronomy and Astrophysics. (2) |
| Planetary nebulae. (2) |
| Spiral galaxies. (1) |
| Cosmic abundances. (2) |
| Physics, Astronomy and Astrophysics. (2) |
| Planetary nebulae. (2) |
| Spiral galaxies. (1) |