The DIRECT Project
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[8] DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. IX. Variables in the Field M31Y Discovered with Image Subtraction , 2003, astro-ph/0303307.
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[11] DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. V. Variables in the Field M31F , 1999, astro-ph/9904343.
[12] DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. III. Variables in the Field M31C , 1999, astro-ph/9901331.
[13] A. Herrero,et al. Differential O and Si Abundances in M33 Early B Supergiants , 2000 .
[14] J. L. Tonry,et al. DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. II. Variables in the Field M31A , 1997 .