Hubble Space Telescope Science Metrics
  Since its launch in April 1990, the Hubble Space Telescope (HST) has produced an increasing flow of scientific results. The large number of refereed publications based on HST data allows a detailed evaluation of the effectiveness of this observatory and of its scientific programs. This paper presents the results of selected science metrics related to paper counts, citation counts, citation history, high-impact papers, and the most productive programs and most cited papers, through the end of 2003. All these indicators point towards the high-quality scientific impact of HST. 
Georges Meylan, Juan P. Madrid, Duccio Macchetto (STScI)