Crystal structure of tetraaqua-[6-(5-carboxypyridin-2-yl)- nicotinato]nickel(II), Ni(H2O)4(C12H6N2O4) - Jiang Ling; Wang Ji-Wu; Ren Yi-Xia; Wang Ji-Jiang; Hou Xiang-Yang (Zeitschrift für Kristallographie - New Crystal Structures, 2009)