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High-quality atomic electron densities are often approximated by limited-size expansions able to reproduce particular features of a reference function. Recent examples are the exponential sets of Koga [(2000)Theor. Chim. Acta 95: 113] and the Gaussian core densities of Cioslowski et al. [(1997) J. Chem. Phys. 106: 3607]. Since atomic densities have a rich structure and should obey theoretical conditions,...
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