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Zi J, Yu X, Li Y, Hu X, Xu C, Wang C, Wang X, Liu X and Fu R (2003), `Coloration strategies in peacock feathers', Proceedings of the national academy of sciences of the United States of America, 100 (22), 12576±12578. Zins H M (1998), `Testing and evaluation of surgical gown fabricscomments and concerns', AJIC Am J Infect Control, 26, 364