Photometric and Spectroscopic Studies of the Stellar Population within 20pc of the Galactic Center Haller, J. W. ; Reike, M. J. ; Reike, G. H. ; Speer, J. H. ; Frogel, J. A. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1991 Bibcode: 1991BAAS...23.1346H