Harry P. Gregor, Mary Jane Hamilton, Jane Becher, and Fabian Bernstein
Studies on Ion Exchange Resins. XIV. Titration, Capacity and Swelling of Methaerylic Acid Resins
J. Phys. Chem. Vol. 59, No. 9: September 1955 pp 874 - 881;
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http://dx.doi.org/10.1021/j150531a017
Phosphorus pentoxide-methanesulfonic acid. Convenient alternative to polyphosphoric acid
J. Org. Chem. Vol. 38, No. 23: November 16, 1973 pp 4071 - 4073;
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http://dx.doi.org/10.1021/jo00987a028