Dark Matter Searches with GLAST
Bill Atwood, Aug 5 2004
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For diffuse photons from the Galaxy (and in particular the center):
A Strong, I. Moskalenkov, O. Reimer, Diffuse Galactic Continuum Gamma Rays. 
A Model compatible with EGRET Data and Cosmic Ray Measurements (Jun 2004)
http://lheawww.gsfc.nasa.gov/users/imos/papers/0406254.pdf 

For an extensive an excellent review of Dark Matter:
Dark matter: models and methods for detection
http://web.iihe.ac.be/seminars/Lars_Berstrom.pdf

For an extensive and good paper on the Galactic Center:
A. Cesarini, F. Fucito, A. Lionetto, A. Morselli, P. Ullio
The Galactic Center as a Dark Matter Gamma-Ray Source
http://arxiv.org/abs/astro-ph/0305075