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2. Huiren Hu, Lixin Xu: Paper Chemicals (China Light Industry Press, Beijing 2002). In Chinese.
3. Shuhui Yang: Plant Fiber Chemistry (China Light Industry Press, Beijing 2001). In Chinese.
4. Guolin Huang, Chengfang Zhang: Chemical Progress Vol. 25 (2001), p.21. In Chinese.
5. Guoyun Zhang, Xiufang Yang and Fangling Cheng: Chinese Paper Vol. 27 (2006), p.68. In Chinese.