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Cover: FIG. 1(c). SEM image of polymorphous ZnO samples produced at en/Zn2+ molar ratio of 1.0. [G. Tong, F. Du, C. Tong, Y. Liu, and J. Tao: Selective Synthesis and Shape-Dependent Microwave Electromagnetic Properties of Polymorphous ZnO Complex Architectures. p. 649].