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Alan J. Shusterman; Gwendolyn P. Shusterman (1997). "Teaching Chemistry with Electron Density Models". The Journal of Chemical Education. 74 (7): 771–775. Bibcode:1997JChEd..74..771S. doi:10.1021/ed074p771.
Handy, Nicholas C.; Schaefer, Henry F. (1984). "On the evaluation of analytic energy derivatives for correlated wave functions". The Journal of Chemical Physics. 81 (11): 5031–5033. Bibcode:1984JChPh..81.5031H. doi:10.1063/1.447489.