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Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 13, No. 5, pp. 661–665, September–October, 1977.
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Luzanov, A.V., Pedash, Y.F. Indirect evaluation of correlation effects in molecules with the aid of the variance of the energy. Theor Exp Chem 13, 498–501 (1978). https://doi.org/10.1007/BF00520581
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DOI: https://doi.org/10.1007/BF00520581