1. Olah, G.A., Prakash, G.K.S., Molnar, A., and Sommer, J., Superacid Chemistry, New York Wiley, 2009.
2. Olah, G.A. and Klumpp, D.A., Superelectrophiles and Their Chemistry, New York Wiley, 2008.
3. Subramanian, L.R., Martinez, A.G., Hanack, M., Prakash, G.K.S., and Hu, J., Encyclopedia of Reagents for Organic Synthesis, New York Wiley, 2006.
4. Siegemund, G., Schwertfeger, W., Feiring, A., Smart, B., Behr, F., Vogel, H., and McKusick, B., Ullmann’s Encyclopedia of Industrial Chemistry, New York Wiley, 2000.
5. Howells, R.D. and Mc Cown, J.D., Chem. Rev., 1977, vol. 77, p. 69.