1. Detection of CO emission from massive molecular clouds in the inner disk of M31
2. Allen, R. J. & Lequeux, J. 1994, in The Nuclei of Normal Galaxies: Lessons from the Galactic Center, ed. R. Genzel & A. Harris (NATO ASI Ser. C, 445) (Dordrecht: Kluwer), 105
3. Toward High‐Precision Astrometry with WFPC2. I. Deriving an Accurate Point‐Spread Function
4. Anderson, J., King, I. R. & Sosin, C. 1995, in Calibrating Hubble Space Telescope: Post Servicing Mission, ed. A. Koratkar & C. Leitherer (Baltimore: STScI), 300
5. SExtractor: Software for source extraction