Yan Zhitui: razlika između inačica
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Redak 3:
==Izvori==
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*{{cite book |
*{{cite book |last=Needham |first=Joseph |title=Science and Civilization in China: Volume 5, Chemistry and Chemical Technology, Part 1, Paper and Printing |year=1986 |publisher=Cambridge University Press |location=Cambridge |isbn=0-521-08690-6 }}
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