Synthesis and Characterization of Several Soluble Tetraphenoxy-Substituted Copper and Zinc Phthalocyanines - Ma, Chunyu; Tian, Dongliang; Hou, Xiaoke; Chang, Yuchun; Cong, Fangdi; Yu, Haifeng; Du, Xiguang; Du, Guotong (Synthesis, 2005)