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References

Fernandez, J.; Martin, F. (2007). "Photoionization of the HeH2+ molecular ion". J. Phys. B: At. Mol. Opt. Phys. 40 (12): 2471–2480

Saunders, M.; Jiménez-Vázquez, H. A.; Cross, R. J.; Poreda, R. J. (1993). "Stable compounds of helium and neon. He@C60 

Hwang, Shuen-Chen; Lein, Robert D.; Morgan, Daniel A. (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383.