B. A. Hess, “Applicability of the no-pair equation with free-particle projection operators to atomic and molecular-structure calculations,” Phys. Rev. A, 32 (1985) 756-63. DOI: 10.1103/PhysRevA.32.756
B. A. Hess, “Applicability of the no-pair equation with free-particle projection operators to atomic and molecular-structure calculations,” Phys. Rev. A, 32 (1985) 756-63. DOI: 10.1103/PhysRevA.32.756
