1. Lomax, M. Polym. Test., 1, No. 2, 1980.
2. Lomax, M. Polym. Test., 1, No. 3, 1980.
3. Brown R P (Editor). Handbook of Polymer Testing, Marcel Dekker, New York, 1999.
4. Yasuda H and Stannet V. Polymer Handbook, 2nd Edition (Ed. J. Brandrup and E.H. Immergut), John Wiley and Sons, 1975.
5. ISO 2782, 1995. Determination of permeability to gases.