An Efficient Method of Birch Ethanol Lignin Sulfation with a Sulfaic Acid-Urea Mixture von Levdansky, Alexander V., Vasilyeva, Natalya Yu, Malyar, Yuriy N., Kondrasenko, Alexander A., Fetisova, Olga Yu, Kazachenko, Aleksandr S., Levdansky, Vladimir A., Kuznetsov, Boris N.

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