Tham khảo Nguyên tử heli

↑ “Helium - PubChem Public Chemical Database”. The PubChem Project. USA: National Center for Biotechnology Information.
↑ G.W.F. Drake and Zong-Chao Van (1994). "Variational eigenvalues for the S states of helium", Chem. Phys. Lett. 229 486–490.
↑ Zong-Chao Yan and G. W. F. Drake (1995). "High Precision Calculation of Fine Structure Splittings in Helium and He-Like Ions", Phys. Rev. Lett. 74, 4791–4794.
↑ G.W.F. Drake, (1999). "High precision theory of atomic helium", Phys. Scr. T83, 83–92.
↑ J.D. Baker, R.N. Hill, and J.D. Morgan III (1989), "High Precision Calculation of Helium Atom Energy Levels", in AIP ConferenceProceedings 189, Relativistic, Quantum Electrodynamic, and Weak Interaction Effects in Atoms (AIP, New York),123
↑ Jonathan D. Baker, David E. Freund, Robert Nyden Hill, and John D. Morgan III (1990). "Radius of convergence and analytic behavior of the 1/Z expansion", Physical Review A 41, 1247.
↑ Scott, T. C.; Lüchow, A.; Bressanini, D.; Morgan, J. D. III (2007). “The Nodal Surfaces of Helium Atom Eigenfunctions”. Phys. Rev. A 75 (6): 060101. Bibcode:2007PhRvA..75f0101S. doi:10.1103/PhysRevA.75.060101.
↑ G.W.F. Drake and Z.-C. Yan (1992), Phys.Rev. A 46,2378-2409. .
↑ G.W.F. Drake (2006). "Springer Handbook of Atomic, molecular, and Optical Physics", Edited by G.W.F. Drake (Springer, New York), 199-219.

David I. Griffiths Introduction to Quantum Mechanics Second edition year 2005 Pearson Education, Inc
B.H. Bransden and C.J. Joachain's Physics of Atoms and Molecules 2nd edition Pearson Education, Inc

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