Citation: Hou Hongwei; Wie Yong-Li; Zhu Yu; Song Yinglin; Fan Yaoting (2004). Two novel two-dimensional cluster polymers ((N Me4)2 (M O S3 Cu3 (mue2-I)3)) (M= Mo, W): synthesis, crystal structure and interesting optical alternation from self-defocusing to self-focusing. Inorganica Chimica Acta, 357, pp. 421-428.