Name: GaussSum
Reference:
 - Author: James J. P. Stewart
   Title: "MOPAC: A semiempirical molecular orbital program"
   Journal: J. Comput.-Aided Mol. Design
   Year: 1990
   Volume: 4
   Number: 1
   Pages: 1-103
   URL: http://www.springerlink.com/content/p11150521612jm27/
   eprint: http://www.springerlink.com/content/p11150521612jm27/fulltext.pdf
   DOI: 10.1007/BF00128336
