Name: GaussSum
Reference:
 - Author: Noel M. O'Boyle and Adam L. Tenderholt and Karol M. Langner
   Title: "cclib: A library for package-independent computational chemistry algorithms"
   Journal: J. Comp. Chem.
   Year: 2008
   Volume: 29
   Number: 5
   Pages: 839-845
   URL: http://onlinelibrary.wiley.com/doi/10.1002/jcc.20823/abstract
   DOI: 10.1002/jcc.20823
