Tony C. Scott M. Aubert-Frécon D. Andrae J. Grotendorst J. D. Morgan III M. Lawrence Glasser Exchange Energy for Two-Active-Electron Diatomic Systems Within the Surface Integral Method. 101-128 2004 15 Appl. Algebra Eng. Commun. Comput. 2 http://www.springerlink.com/index/10.1007/s00200-004-0156-6 db/journals/aaecc/aaecc15.html#ScottAAGMG04