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Helgaker, Trygve, Jorgensen, Poul, Olsen, Jeppe. (2000). Molecular electronic-structure theory . West Sussex: John Wiley & Sons.

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Helgaker, Trygve, Jorgensen, Poul, Olsen, Jeppe. Molecular electronic-structure theory. West Sussex: John Wiley & Sons, 2000. Text.

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Helgaker, Trygve, Jorgensen, Poul, Olsen, Jeppe. Molecular electronic-structure theory. West Sussex: John Wiley & Sons, 2000. Text.

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Helgaker, Trygve, Jorgensen, Poul, Olsen, Jeppe. Molecular electronic-structure theory. West Sussex: John Wiley & Sons, 2000. Print.