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2. Improved Electrometric Apparatus for Use with Karl Fischer Method for Determination of Water
3. Mitchell, J., Jr. "Aquammetry," New York, Interscience Publishers, Inc., 1948, 444 pp.
4. Accessibility of Cellulose by Formic Acid Esterification
5. Ott, E. "Cellulose and Cellulose Derivatives," New York , Interscience Publishers, Inc., 1943, p. 755.