STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR Ⅱ.Theorctical Prcdiction and Experimental Determination of Ketal Rings Concentrations
Zhu Qingren, Lu Fei, Hong Kunlun, Wen Jun, Wang Lan, Xu Guangzhi
Chinese Journal of Magnetic Resonance . 1995, (2): 189 -194 . 

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