STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR (Ⅰ)
Zhu Qingren, Wang Shouchen, Hang Kunlun, Lu Fei, Qi Rongrng, Xu Guangzhi
Chinese Journal of Magnetic Resonance . 1995, (1): 39 -46 . 

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