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== | == Referències == | ||
* Joseph Needham; Tsien Tsuen-Hsuin (11 de julio de 1985). Science and Civilisation in China: Volume 5, Chemistry and Chemical Technology, Part 1, Paper and Printing. Cambridge University Press. p. 234 | * Joseph Needham; Tsien Tsuen-Hsuin (11 de julio de 1985). Science and Civilisation in China: Volume 5, Chemistry and Chemical Technology, Part 1, Paper and Printing. Cambridge University Press. p. 234 | ||
* Woods, Michael; Woods, Mary (2000). Ancient Communication: Form Grunts to Graffiti.pp 51–52. Minneapolis: Runestone Press; an imprint of Lerner Publishing Group | * Woods, Michael; Woods, Mary (2000). Ancient Communication: Form Grunts to Graffiti.pp 51–52. Minneapolis: Runestone Press; an imprint of Lerner Publishing Group | ||