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George A. Olah, Schlosberg RH (1968). "Chemistry in Super Acids. I. Hydrogen Exchange and Polycondensation of Methane and Alkanes in FSO3H–SbF5 ("Magic Acid") Solution. Protonation of Alkanes and the Intermediacy of CH5+ and Related Hydrocarbon Ions. The High Chemical Reactivity of "Paraffins" in Ionic Solution Reactions". Journal of the American Chemical Society. 90: 2726–7. doi:10.1021/ja01012a066.
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Hall NF, Conant JB (1927). "A Study of Superacid Solutions"(PDF). Journal of the American Chemical Society. 49: 3062–70. Diarsipkan dari versi asli(PDF) tanggal 2007-09-29. Diakses tanggal 2008-06-24.