title: The Douglas-Kroll-Hess approach.
authors.affiliation: Computational Molecular Science Research Team, Advanced Institute for Computational Science, RIKEN, 7-1-26 Minatojima-minami, Cyuo, Kobe, Hyogo 650-0047, Japan.
authors.forename: Takahito
authors.initials: T
authors.lastname: Nakajima
authors.forename: Kimihiko
authors.initials: K
authors.lastname: Hirao