Cautionary remark on applying symmetry techniques to the Coulomb problem
Dennis Aebersold and L. C. Biedenharn
Phys. Rev. A 15, 441 (1977) - Published 1 February, 1977
Third-order energy for the ground state of three-electron atoms in -dependent perturbation theory
Yat Yan Yung, Frank C. Sanders, and Robert E. Knight
Phys. Rev. A 15, 444 (1977) - Published 1 February, 1977
Wigner function as the expectation value of a parity operator
Antoine Royer
Phys. Rev. A 15, 449 (1977) - Published 1 February, 1977