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\bibitem{LobatoHoyos+vanDyck2014} {\textquotedblleft}\textit{An accurate parameterization for scattering factors, electron densities and electrostatic potentials for neutral atoms that obey all physical constraints}{\textquotedblright}. Lobato Hoyos IP, van Dyck D, Acta crystallographica: section A: foundations of crystallography \textbf{70}, 636 (2014).   http://doi.org/10.1107/S205327331401643X

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