[4] Schwartz C. Experiment and theory in computations of the He atom ground state ［J］. Int. J. Mod. Phys. E, 2006, 15: 877.
[5] Nakashima H, Nakatsuji H. Solving the Schrdinger equation for helium atom and its isoelectronic ions with the free iterative complement interaction (ICI) method ［J］.J. Chem. Phys., 2007, 127: 224104.
[6] Nakashima H, Hijikata Y, Nakatsuji H. Solving the electron and electron-nuclear Schrdinger equations for the excited states of helium atom with the free iterative-complement-interaction method ［J］. J. Chem. Phys., 2008, 128: 154108.
[7] Drake Gordon W F. Springer Handbook of Atomic, Molecular, and Optical Physics ［M］. New York: Springer-Verlag, 2005: 205-206.
