Xin Xu, and William A. Goddard III*, The X3LYP Extended Density Functional for Accurate Descriptions of Nonbond Interactions (London Forces, electrostatics, and hydrogen bonding), spin states, and Th

Xin Xu, and William A. Goddard III*,  The X3LYP Extended Density Functional for Accurate Descriptions of Nonbond Interactions (London Forces, electrostatics, and hydrogen bonding), spin states, and Thermochemical Properties, Proc. Natl. Acad. Sci. USA, 101(9) (2004) 2673-2677.