H. Thomassen, S. Gundersen and S. Samdal, The molecular structures, conformations and force fields of bis(chloroimino)butanedinitrile as studied by gas-phase electron diffraction and quantum chemical calculations, Journal of Molecular Structure, Vol. 928, Issues 1-3, 2009, Pp. 182-188.
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http://dx.doi.org/10.1016/j.molstruc.2009.03.032