Crystal structure of hexaaquanickel(II) bis[1-(carboxylatomethyl)-1,3- benzimidazol-3-ium-3-acetato] dihydrate, [Ni(H2O)6](C11H9N2O4)2 · 2H2O - Huang Ling (Zeitschrift für Kristallographie - New Crystal Structures, 2008)