Sekharan Sivakumar, Altun Ahmet, Morokuma Keiji
Department of Chemistry, Cherry L. Emerson Center for Scientific Computation, Emory University, 1515 Dickey Drive, Atlanta, GA 30322, USA.
Chemistry. 2010 Feb 8;16(6):1744-9. doi: 10.1002/chem.200903194.