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- [8] THE EFFECT OF HELIUM DIFFUSION ON THE AGES OF GLOBULAR-CLUSTERS ASTROPHYSICAL JOURNAL, 1992, 388 (02): : 372 - 382
- [10] THE HORIZONTAL-BRANCH STARS IN GLOBULAR-CLUSTERS .1. THE PERIOD-SHIFT EFFECT, THE LUMINOSITY OF THE HORIZONTAL BRANCH, AND THE AGE-METALLICITY RELATION ASTROPHYSICAL JOURNAL, 1990, 350 (01): : 155 - 172