1. CRC Handbook of Chemistry and Physics, 64th ed., CRC Press, Boca Raton, Fl, pp. 83–84.
2. R.K.A.M. Mallant, et al., Electrolytic membrane, method of manufacturing it and use, Patent WO98/20063.
3. J.M Smith, et al., Introduction to Chemical Engineering Thermodynamics, fourth ed., McGraw Hill, Singapore, 1987, ISBN 0-07-100303-7.
4. Studies on ion-exchange membranes. Part 1. Effect of humidity on the conductivity of Nafion®;V Anantaraman;J. Electroanal. Chem.,1996