C.-C. WANG, “Hydrothermal Synthesis, Crystal Structure and Optical Property of A 2-D Organic-Inorganic Compound Ni(V2W4O19)(bpy)(Hbpy)2 (bpy = 4,4’-Bipyridine”, ajc, vol. 21, no. 6, pp. 4919–4926, Mar. 2010.